Definitions for "Flight Number"
A one to four character alpha-numeric code for a particular flight. ( Airline On-Time Performance Data, Official Airline Guide )
A combination of two letters, indicating the airline, and three or four digits indicating the number of the voyage.
A number assigned to each airline flight, enabling the airline to keep track of information for every flight, including departure and arrival times, and passengers.
Keywords:  designation
The designation of a flight.