The carrier (airline) is represented by a standardized two-character alphanumeric code. In the example above, Thai Airways is TG. The departure and destination cities are represented by International Air Transport Association airport codes. In the example above, Munich is MUC and Bangkok is BKK. The International Air Transport Association is the standard setting organization.
If more ticketholders arrive at the airport than the plane can carry the airline will refuse to board some passengers (colloquially known as "bumping" them) and provide them compensation based on the regulations that apply to that flight. Usually in this scenario a carrier will ask if there are any passengers willing to volunteer to be "bumped" before involuntarily refusing to board passengers. If there are volunteers, the airline will negotiate compensation with those passengers, usually in the form of vouchers good towards future flights.[3]
When paper tickets were still frequently used, some travellers resold their (person-specific) tickets to other travellers (often at discount prices) when their travel plans changed. The seller would then accompany the buyer to the airport at the time of departure. The original owner would check in under his own name, and would check in the buyer's baggage. The buyer then boarded the airplane.[7] However, since most airlines check identification on boarding, this procedure is rarely functional.[8] Using another person's ticket is also illegal in many jurisdictions.
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