Itinerary: A route of journey proposed by a traveler
Ticket: (Usually) a printed piece of paper or card showing that its holder has the right to use services on one or more specific flights
Travel agency: A business that attends to the travel needs of an individual or a group of individuals
Airlines need to maintain multiple types of information
Route information: Covers the destinations served by the airline
Aircraft information: Information on the aircrafts used by the airline
Schedule information: Covers information on days and times on which the flights operated by the airline are scheduled to run
Fare information: Prices for various flights
Reservation information: Passenger and cargo reservations, including information on passenger tickets