Reissue	When a new ticket is issued as a result of a change of plans. This can often require fees or penalties from the airport.
Re-validation	A method by which an airline gives the authority to change a flight time or date of travel without having to reissue the ticket (may only be done if cities and fares are not changed).
Scheduled carrier	An airline that offers regularly scheduled flights between destinations.
Stopover	See Layover
Through Flight	A flight with a number of layovers where the airlines have an alliance (codeshare), thereby offering benefits to the traveller, such as luggage checked through to final destination.