http://www.rfc-editor.org/rfc/rfc2351.txt
RFC 2351: Mapping of Airline Reservation, Ticketing, and Messaging Traffic over IP, A. Robert1998-05-01T23:00:00-00:00This memo specifies a protocol for the encapsulation of the airline specific protocol over IP. This memo provides information for the Internet community. It does not specify an Internet standard of any kind.