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Delta Air Lines aircraft parked on a taxiway at Kansas City International Airport. As of February 2025, the Delta Air Lines fleet consists of 988 mainline aircraft, making it the second largest commercial airline fleet in the world after United Airlines. [63] [64] [65] Delta Air Lines operates a fleet manufactured by Airbus and Boeing. [66]
The departure control system (DCS) is the system used by airlines and airports to check-in a passenger. The DCS is connected to the reservation system enabling it to check who has a valid reservation on a flight. The DCS is used to enter information required by customs or border security agencies and to issue the boarding document.
Before the introduction of SABRE, the airline's system for booking flights was entirely manual, having developed from the techniques originally developed at its Little Rock, Arkansas, reservations center in the 1920s. In this manual system, a team of eight operators would sort through a rotating file with cards for every flight.
Flight tracking enables travellers as well as those picking up travellers after a flight to know whether a flight has landed or is on schedule, for example to determine whether it is time to go to the airport. Aircraft carry ADS-B transponders, which transmit information such as the aircraft ID, GPS position, and altitude as radio signals.
In airline reservation systems, a record locator is an alphanumeric code used to identify and access a specific record on an airline’s reservation system. An airline’s reservation system automatically generates a unique record locator whenever a customer makes a reservation or booking, commonly known in the industry as an itinerary.
Today, DCS mostly (98%) manage e-tickets using interfaces from a number of devices, including check-in kiosks, online check-in, mobile boarding cards, and baggage handling. DCS are able to identify, capture and update reservations from an airline's computer reservation system for passengers stored in a so-called passenger name record (PNR). A ...
In addition to these "standardized" GDS, some airlines have proprietary versions which they use to run their flight operations. A few examples are Delta's OSS and Deltamatic systems and EDS SHARES. SITA Reservations remains the largest neutral multi-host airline reservations system, with over 100 airlines currently managing inventory.
VRs are comments made by the airline, typically generated automatically once the booking or request is completed. These will normally include the airline's own record locator, replies to special requests, and advice on ticketing time limits. While normally sent by the airlines to an agent, it is also possible for an agent to send a VR to an ...