For example, if M class is not available, K class can be booked on the return, provided that the restrictions mentioned apply. As another alternative if the applicable inventory is not available, you may be able to standby at the airport. Check with your airline for details. Back to Top Revalidate Generally airline tickets are valid for one year from date of issue. If the airline were to revalidate a ticket, its value could be extended beyond one year.
Some fares specifically exclude revalidation.
Back to Top Round Trip Travel from A to B then back from B to A using the same fare basis code . See also circle trip . The routing rule lists the allowed connecting cities for travel from A to B for a particular fare. Sometimes this rule indicates that travel must be nonstop . A segment refers to a single flight with the same flight number.