Flight regulations depend on every airline company, below is those of Vietnam Airlines.
RESERVATION
Vietnam Airlines offices and sales agents worldwide are always at your service. To locate the office nearest you. Vietnam Airlines uses the SITA GABRIEL II reservation system, and we are also accessible through AMADEUS, ABACUS, INFINI, SABRE, WORLDSPAN, AXESS, GALILEO, TOPAS, and MIS. Our telephone sales representatives can help you with information, booking and ticketing.
Remember to give the agent your telephone number or address in case we need to advise you of changes to your flight schedule. more…