Booking: A selection of flights reserved with an airline, for a passenger’s intended journey.
Carrier: An airline
Child: A passenger between 2 and 12 years of age
Commission: Amount of money earned from the sale of flights and other services.
Commission is usually percentage of sales price.
Code share: A single flight on which space is shared and sold by two or more airlines. A ticket may be issued under the code of either airline and the flight may have two or more flight numbers.
Configuration: This refers to the arrangement of seats on an air craft.
Connecting flight: A flight which delivers a passenger to another aircraft in another city.
Direct Flight: This is a flight which, normally does not require passengers to change
aircraft between the starting point and destination.

Down grade: This simply means to be moved to a lower class of service.
Endorsement: This is an authority for travel documents issued by one carrier to be used
for travel on another carrier.
Gateway: The international arrival/departure point in a carrier’s home country.
Infant: This is a passenger who have not yet reached their second (2nd) year birthday.
Go-show: This is when a passenger shows up for flight with out a reservation
No-Show: This when a passenger holding a flight reservation who fails to use it and cancel it prior to the flight departure.
On request: This refers to the status of a seat request i.e. not yet confirmed.
Open Ticket: This is ticket which has been issued for a particular journey but on which a specific date has yet to be entered.
Overbooking: A situation in which more seats have been sold than are available on an aircraft.
Refund: This is reimbursement to the purchaser of all, or a portion, of a fare for an unused service.
Revalidation: Procedure for amending previously arranged flight details. A sticker with details of the new flight is attached to the flight coupon.
Stand-by: This refers to a traveler who has no reservation but is ready to travel on a fully booked flight who waits to see if a seat becomes available.
Stop-Over: Deliberate interruption of a journey, planned by the passenger, at a place between the origin and destination.
Unaccompanied Minor (UM): This simply means a child, up to the age of 12, who travels alone, not accompanied by an adult.