Passenger handling: check-in, boarding and departure control systems

In short

Passenger handling is the sequence of commercial and documentary steps that moves a ticketed passenger from the terminal entrance to the aircraft door: acceptance (check-in), baggage acceptance and tagging, seat allotment, document and special-needs handling, gate boarding and flight close-out. A departure control system (DCS) is the software that performs all of this — it holds the flight's seat map and passenger list, prints boarding passes and bag tags, computes weight and balance, and transmits the close-out messages. It matters because the departure punctuality (OTP), the aircraft's legal load sheet and the airline's revenue from excess baggage and ancillaries all pass through this one process. It is examined in airport management and aviation BBA papers, and tested directly in recruitment for airline and ground-handling customer-service roles (Air India, IndiGo, Akasa, SpiceJet, AISATS, Celebi, Bird Group, Indo Thai, AAI, Adani Airports, GMR, Bangalore International Airport).

Explained

1. Where passenger handling sits, and the time milestones

• Chain: reservation (GDS/airline website) → inventory (seats for sale) → DCS (the flight on the day of operation) → boarding → close-out → arrival handling.
• A reservation creates a PNR (Passenger Name Record: name, itinerary, contact, fare, SSRs) and an e-ticket (ETKT) coupon that must be in "OPEN FOR USE" status before acceptance.
• Flight initialisation: usually 24–48 hours before departure the DCS opens the flight and receives the PNL (Passenger Name List) and successive ADL (Addition/Deletion List) updates from reservations.
• Typical Indian milestones (airline-set and published in the conditions of carriage, not a single statutory figure): web check-in opens 48 h or 24 h before departure; airport counters open 2–3 h before; counter closure 45 min before a domestic and 60 min before an international departure; boarding starts 30–40 min before; gate closes 20–25 min before STD; doors closed and load sheet signed before pushback.
• Reporting time is the airline's instruction to the passenger; check-in close is the hard cut-off after which the system will not accept.

2. Modes of check-in (types and classification)

• Full-service counter check-in: agent at a desk on the CUTE/CUPPS network; accepts documents and baggage, issues boarding pass and bag tag.
• Dedicated vs common-use counters: dedicated counters belong to one airline; common-use counters are shared infrastructure allotted by the airport operator — CUTE (Common Use Terminal Equipment) and its IATA standard successor CUPPS (Common Use Passenger Processing Systems) let any airline's DCS run on any desk.
• CUSS kiosks (Common Use Self Service): passenger prints boarding pass and bag tag; airport-owned, multi-airline.
• OLCI (online/web check-in) and mobile check-in: boarding pass delivered as PDF, mobile barcode or wallet pass; bag drop only at the airport.
• Self Bag Drop (SBD): passenger weighs, tags and injects the bag; staff do a one-time ID/bag check. Running at Delhi T3, Bengaluru T2, Hyderabad, Mumbai T2 among others.
• Auto check-in (airline assigns a seat automatically), off-airport/city check-in, through check-in (boarding pass and bag tag to the final destination on a connecting or interline itinerary), remote/manual check-in when the DCS is down.
• Counter layout: linear (counters in a row along the frontage) vs island (counters back-to-back around a baggage belt); flow-through desks have an in-line belt behind each position. Queue types: economy, premium/business, bag-drop-only, group/charter, special assistance.
• DigiYatra: voluntary, consent-based facial-recognition entry and boarding, Aadhaar/ID verified once, used at a growing list of Indian airports; the passenger may always choose the normal document check instead.

3. The acceptance process, step by step

1. Call the PNR (by name, PNR, ticket, frequent-flyer or barcode scan) in the DCS.
2. Verify identity and, for international travel, passport validity, visa, onward documents and health/entry requirements — the carrier is liable for an inadmissible passenger (INAD).
3. Validate the e-ticket coupon and fare conditions; collect any change fee, excess baggage or ancillary charge.
4. Weigh and accept baggage: count pieces, record weight, check prohibited and dangerous goods (lithium batteries, power banks and spare batteries travel only in cabin baggage), apply LAGs and cabin-bag limits.
5. Tag the bags: printed tag carrying the 10-digit IATA licence-plate number (Resolution 740) and a bar/RFID code; issue the baggage identification stub to the passenger.
6. Allot the seat honouring SSRs, exit-row restrictions (no infant, UMNR or reduced-mobility passenger in an emergency-exit row), and any trim requirement from load control.
7. Enter/confirm SSRs and API data: Advance Passenger Information (name, DOB, document) is transmitted to the destination authorities for international flights.
8. Issue the boarding pass — IATA BCBP (Resolution 792) 2D PDF417 barcode or Aztec on a mobile device, containing flight, seat, sequence number and security-check data.
9. Direct the passenger to security and the gate; brief on boarding time and gate number.
10. Close the flight at cut-off; resolve standbys, upgrades and offloads.

4. Special categories and SSR codes

• WCHR (wheelchair to ramp, can climb steps), WCHS (cannot climb steps), WCHC (immobile, needs carry/aisle chair); BLND, DEAF, DPNA (intellectual/developmental disability), MEDA (medical case, may need MEDIF/medical clearance), STCR (stretcher), OXYG.
• UMNR (unaccompanied minor — handling form, escort to and from the aircraft, handover to a named receiver), INFT (infant, no seat), CHLD, EXST (extra seat), PETC/AVIH (pet in cabin/hold), DEPA/DEPU (deportee accompanied/unaccompanied).
• DGCA CAR Section 3, Series M, Part I governs carriage of persons with disability or reduced mobility — an airline cannot refuse carriage on the ground of disability, wheelchairs and assistive devices are carried free, and assistance from kerb to seat must be provided.
• Expectant mothers, obese passengers needing an extra seat, and prisoners under escort are accepted under the airline's published conditions; refusal of carriage must be documented.

5. The departure control system: modules and messages

• Modules: flight/inventory interface, check-in and acceptance, seating, baggage handling and reconciliation, weight and balance (load control), boarding control (gate reader), flight finalisation and reporting, plus interfaces to BRS, security, immigration/API and the airport's FIDS and billing.
• Platforms used in India: Amadeus Altéa Departure Control (adopted by Air India), Navitaire New Skies (long used by IndiGo), SITA Departure Control, Sabre/Radixx and AirIT/Hitit on other carriers; vendor contracts change, so verify which carrier is on which platform before quoting it.
• Key messages generated at or after close-out: PFS (Passenger Final Sales/Final Status), PSM (Passenger Service Message — special handling for downline stations), PTM (Passenger Transfer Message), SOM (Seat Occupied Message), LDM (Load Distribution Message), CPM/UCM (container/pallet distribution and ULD control), MVT (movement: OUT/OFF/ON/IN times), BSM (Baggage Source Message to the BRS).
• Baggage reconciliation: IATA Resolution 753 requires tracking of baggage at acquisition, loading, transfer and delivery; a checked bag may not fly without its passenger on most security regimes, so an offloaded passenger triggers a bag pull.
• Load control output: the load sheet (DOW, payload by zone, ZFW, TOW, LW, CG/index and trim) and the loading instruction report (LIR). It must be signed/accepted by the commander before departure.
• Fallback: when the DCS is unavailable, stations revert to the manual load sheet and manual boarding pass/handwritten tag procedures in the Ground Operations Manual — examiners like this question.

6. Boarding and gate control

• Pre-boarding: reduced-mobility passengers, UMNRs, families with infants, then status/priority tiers.
• Sequencing methods: back-to-front by zones, outside-in (WILMA — window, middle, aisle), rotating/block zones, or free-for-all on low-cost carriers; outside-in is the fastest in simulation because it minimises seat interference, back-to-front the most common in practice.
• Gate reader scans the BCBP barcode; the DCS updates boarding status, blocks a duplicate or wrong-flight pass, and produces a live gate no-show list.
• Head count reconciliation: boarded count from the gate reader must equal the load sheet passenger figure by class and by zone; a mismatch is resolved before doors close (physical head count by cabin crew).
• Gate no-show / offload: an accepted passenger who does not board is offloaded in the DCS, the bag is identified from the BSM and pulled, and the load sheet is re-issued.
• Denied boarding (oversale): under DGCA CAR Section 3, Series M, Part IV, if the airline arranges an alternate flight within one hour of the original departure, no compensation is payable; otherwise compensation is 200% of the booked one-way basic fare plus airline fuel charge (capped at ₹10,000) if the alternate departs within 24 hours, and 400% (capped at ₹20,000) beyond 24 hours, besides a refund where the passenger does not travel. These are the amounts in the current CAR, as amended.
• Baggage liability: governed by the Carriage by Air Act, 1972 (which gives effect to the Warsaw/Hague and Montreal regimes). Under the Montreal Convention the limits revised with effect from 28 December 2024 are about 1,519 SDR for baggage and 6,303 SDR for delay; the rupee figure moves with the SDR rate, and the limit applied to purely domestic Indian carriage is as notified under the Act and published by the carrier.

7. Performance, capacity and level of service

• Design inputs: design-day peak-hour passengers (PHP), show-up profile (fraction of a flight's passengers arriving in each 10- or 15-minute band before STD), transaction time per passenger, and the target maximum queue wait.
• IATA Airport Development Reference Manual (ADRM) gives Level of Service targets — for check-in queuing, an optimum space of roughly 1.6–1.8 m² per standing passenger with baggage and a maximum queue wait of the order of 10–20 minutes for economy; the ADRM is periodically revised, so cite the edition in use.
• Service time benchmarks (indicative): 90–150 s per passenger at a full-service desk, 60–90 s at a kiosk, 30–60 s at a self bag drop, 3–5 s per passenger at a gate scanner.
• Advantages of self-service: lower cost per passenger, less counter frontage, shorter queues, more ancillary upsell. Limitations: document checks for international travel still need staff, exception handling (SSR, groups, interline, irregular operations) cannot be automated, and digital exclusion means counters can never be fully withdrawn.
• Measured KPIs: on-time performance (D-0/D-15), check-in queue time, bags per hour per desk, gate no-show rate, mishandled bags per 1,000 passengers, load-sheet accuracy, DCS downtime.

Key points

• Check-in (acceptance) - verifying the ticket and documents, accepting baggage, allotting a seat and issuing a boarding pass.
• DCS - the day-of-operation system that performs check-in, seating, baggage, load control, boarding and close-out.
• PNR - the reservation record; ETKT - the e-ticket coupon that must be open for use before acceptance.
• PNL/ADL - the passenger list and its updates sent from reservations to the DCS before departure.
• CUTE/CUPPS - common-use desk platforms; CUSS - common-use self-service kiosks; SBD - self bag drop.
• BCBP (IATA Res. 792) - the 2D barcode standard that makes a printed or mobile boarding pass machine-readable.
• Bag tag licence plate (Res. 740) - the unique 10-digit number identifying a checked bag; Res. 753 requires tracking at four points.
• BSM - baggage source message linking a bag to a passenger in the reconciliation system.
• Load sheet - the legal document of DOW, payload, ZFW, TOW, LW and CG, accepted by the commander before departure.
• ZFW/MZFW, TOW/MTOW, LW/MLW - the three weight limits that together fix the allowed traffic load.
• SSR codes - standard four-letter service requests: WCHR, WCHS, WCHC, UMNR, MEDA, PETC, DEPA.
• Gate no-show - an accepted passenger who fails to board; triggers offload and bag pull before departure.
• Denied boarding - compensation under DGCA CAR Section 3, Series M, Part IV, with no compensation if re-accommodated within one hour.
• Through check-in - boarding pass and bag tag issued to the final destination across connecting or interline sectors.
• Show-up profile - the time distribution of passenger arrival before STD; it, not the flight size, drives counter numbers.
• Level of service (ADRM) - space per queuing passenger and maximum wait, the standard used to size check-in halls.
• Outside-in (WILMA) boarding - window, middle then aisle seats; the quickest sequence because it avoids seat interference.
• DigiYatra - voluntary biometric boarding; passengers may always use the manual document check instead.

Formulas and examples

Example 1 — counters for one departure. An A320 with 180 passengers departs at 08:00; check-in opens at 06:00. The station's show-up profile puts 35% of the passengers in the busiest 30 minutes. Agent transaction time is 90 s.

• Peak passengers Pp = 180 × 0.35 = 63.
• Counter-seconds needed = 63 × 90 = 5,670 s.
• Available per counter = 30 × 60 = 1,800 s → C = 5,670 / 1,800 = 3.15 → 4 counters.
• With a self bag drop at 45 s per passenger, C = 5,670/2 ÷ 1,800 ≈ 1.58 → 2 positions would carry the same peak.

Example 2 — queue wait at one desk. Passengers arrive at λ = 2.0 per minute at a single desk serving μ = 2.5 per minute.

• ρ = 2.0/2.5 = 0.80.
• Lq = 0.8²/(1 − 0.8) = 0.64/0.2 = 3.2 passengers waiting.
• Wq = Lq/λ = 3.2/2.0 = 1.6 minutes.
• If λ rises to 2.4/min, ρ = 0.96, Lq = 0.9216/0.04 = 23.04 and Wq = 23.04/2.4 = 9.6 minutes — a 20% rise in demand multiplies the wait six-fold, which is why counters are sized on the peak, not the average.

Example 3 — excess baggage. Domestic economy free allowance 15 kg; a passenger checks 22 kg; the airline's rate is ₹600 per kg.

• Excess = 22 − 15 = 7 kg → 7 × 600 = ₹4,200.
• GST on domestic economy air transport is 5%, so the collected amount ≈ 4,200 × 1.05 = ₹4,410. Allowances and rates differ by airline and fare family (some fares carry no free check-in baggage) — always read the fare rule.

Example 4 — load sheet and allowed traffic load. A320: DOW 42,600 kg, MZFW 62,500 kg, MTOW 77,000 kg, MLW 66,000 kg. Take-off fuel 12,000 kg, trip fuel 9,500 kg. 180 passengers at a standard 80 kg each (including hand baggage, per the operator's DGCA-approved standard weights), 234 bags averaging 18 kg.

• Baggage = 234 × 18 = 4,212 kg; passengers = 180 × 80 = 14,400 kg → traffic load = 18,612 kg.
• ZFW = 42,600 + 18,612 = 61,212 kg ≤ MZFW 62,500 ✔
• TOW = 61,212 + 12,000 = 73,212 kg ≤ MTOW 77,000 ✔
• LW = 73,212 − 9,500 = 63,712 kg ≤ MLW 66,000 ✔
• Allowed TOW = min(77,000; 66,000 + 9,500 = 75,500; 62,500 + 12,000 = 74,500) = 74,500 kg (ZFW-limited).
• Allowed traffic load = 74,500 − 42,600 − 12,000 = 19,900 kg; spare capacity = 19,900 − 18,612 = 1,288 kg, i.e. about 16 more standard passengers or 71 more average bags.

Example 5 — boarding window. 180 passengers, single gate, scanning and walking rate 15 pax/min, 3 minutes for pre-boarding. Boarding starts at STD−35 and the gate must close at STD−20.

• Tb = 180/15 + 3 = 12 + 3 = 15 minutes → boarding ends at STD−20 exactly; any queue stoppage makes the flight late, so either start at STD−40 or use two doors.
• With two doors at 12 pax/min each (24/min): Tb = 180/24 + 3 = 10.5 minutes.

Where it is used

• Airline airport operations: customer service agents, duty officers and station managers at Air India, IndiGo, Akasa Air and SpiceJet work in the DCS all day; a recruitment test will ask for SSR codes, check-in cut-offs and offload procedure.
• Ground handling companies: AISATS, Celebi, Bird Group, Indo Thai and Globe Ground India provide passenger handling under contract, including load control for client airlines.
• Airport operators: AAI, DIAL, MIAL, BIAL, GHIAL and Adani airports own the CUTE/CUPPS desks, kiosks, self bag drops, FIDS and DigiYatra infrastructure and bill airlines for their use.
• Centralised load control and hub control centres (Gurugram, Bengaluru, Mumbai) prepare load sheets remotely for many stations and clear flights by message.
• Technology and BPO roles: Amadeus, SITA, Navitaire/Sabre and airline IT teams configure flights, fare rules, ancillary catalogues and DCS interfaces.
• Regulatory and compliance work: DGCA CAR Section 3 Series M compliance (denied boarding, cancellation, disability), BCAS-mandated cabin-baggage and boarding-pass checks, immigration API transmission for international departures.

Interview questions

• Q: What exactly does a departure control system do? A: It manages the flight on the day of operation — check-in and acceptance, seating, baggage reconciliation data, weight and balance, boarding control and flight close-out, and it sends the PFS, PSM, LDM and MVT messages.
• Q: Difference between a reservation system and a DCS? A: The reservation/inventory system sells and holds the booking (PNR) up to the day of departure; the DCS takes over the flight through the PNL/ADL and handles physical acceptance and departure.
• Q: What are CUTE, CUPPS and CUSS? A: CUTE and its IATA successor CUPPS are common-use desk platforms letting any airline's DCS run on airport-owned counters; CUSS is common-use self-service kiosks shared by several airlines.
• Q: A passenger has checked in and dropped a bag but does not board. What do you do? A: Page and search, then offload the passenger in the DCS, identify the bag from the baggage source message, have it pulled from the hold, re-issue the load sheet and advise the commander.
• Q: Why must a checked bag not travel without its passenger? A: It is a security requirement of passenger-baggage reconciliation under the applicable security programme, and it is the reason Resolution 753 tracking and the BSM link exist.
• Q: Which seats cannot be given to an unaccompanied minor or a wheelchair passenger? A: Emergency exit-row seats, because the occupant must be able to assist in an evacuation; bassinet and bulkhead rules also apply.
• Q: Is a passenger entitled to compensation if denied boarding on an oversold flight? A: Under DGCA CAR Section 3, Series M, Part IV, not if the airline re-accommodates on a flight departing within one hour; otherwise 200% of the booked one-way basic fare plus airline fuel charge up to ₹10,000 within 24 hours, and 400% up to ₹20,000 beyond that, besides a full refund if the passenger chooses not to travel.
• Q: What three weight limits decide how much traffic load you can carry? A: MZFW, MTOW and MLW; the allowed take-off weight is the lowest of MTOW, MLW plus trip fuel and MZFW plus take-off fuel, and the traffic load is what remains after DOW and fuel.
• Q: Which boarding sequence is fastest and why? A: Outside-in (window, middle, aisle), because it removes most seat interference; back-to-front by zones is more common because it is easier to manage with families and status tiers.
• Q: How would you size check-in counters for a new terminal? A: From the design-day peak-hour passengers and the show-up profile, compute peak-period demand, multiply by transaction time, divide by the peak period length, and verify queue wait and queue area against the ADRM level-of-service targets.
• Q: The DCS goes down 40 minutes before departure. What is your action? A: Invoke the manual fallback in the ground operations manual — manual boarding passes and handwritten tags with a sequential list, manual load sheet with standard weights, head count reconciliation, and back-capture into the DCS once restored.
• Q: Is DigiYatra compulsory at Indian airports? A: No, it is voluntary and consent-based; a passenger can always use the normal boarding pass and ID check.

Common mistakes

• Treating "reporting time" and "check-in closure" as the same thing, or quoting one universal cut-off when the figures are airline-published and differ domestic/international.
• Confusing the boarding pass barcode standard (BCBP, Res. 792) with the bag-tag licence plate (Res. 740) and baggage tracking (Res. 753).
• Forgetting that ZFW, not MTOW, is often the limiting weight, and then reporting a traffic load the aircraft cannot legally carry.
• Mixing weight units or using passenger weights without hand baggage when the approved standard weight already includes it.
• Using the average arrival rate instead of the peak-period show-up fraction to size counters — the queue formula is highly non-linear near ρ = 1.
• Writing the denied-boarding compensation as a flat rupee amount; it is a percentage of the booked one-way basic fare plus fuel charge, subject to a cap, and nil if re-accommodated within an hour.
• Describing load control, ramp loading or security screening in a passenger-handling answer and leaving out the acceptance and gate steps the question actually asks for.

Related topics

Airport operations: terminal, airside and landside · Ground handling and ramp operations · Aviation security: BCAS and AVSEC · Airline reservation systems, GDS and e-ticketing · Baggage handling systems and reconciliation · Airline revenue management and ancillary pricing