Article 96 Chicago Convention
For the purpose of this Convention the expression:
(a) “Air service” means any scheduled air service performed by air craft for the public transport of passengers, mail or cargo.
(b) “International air service” means an air service which passes through the air space over the territory of more than one State.
(c) “Airline” means any air transport enterprise offering or operating an international air service.
(d) “Stop for non-traffic purposes” means a landing for any purpose other than taking on or discharging passengers, cargo or mail.
See also: Article 95 Chicago Convention