Flight Number vs Tail Number

An airline flight number generally identifies a scheduled or marketed service rather than one permanent aircraft. The aircraft assigned to that service can change from one day to another.

Codeshare arrangements can also mean a passenger sees a marketing flight number that differs from the operating airline’s identification.

A civil aircraft registration is assigned to the physical aircraft under a national registration system. In the United States, registrations commonly begin with N.

A public tracker may show registration alongside type, operator, route, or callsign when those data are available.

The operational callsign used with air traffic control can differ from the passenger-facing flight number.

The ICAO aircraft address is a unique 24-bit address associated with the aircraft and is distinct from the flight number, squawk code, and registration.