0 an international organization that most of the world's airlines belong to. It represents the airlines when dealing with governments, the public, etc. and sets standards for their work and for flight safety:
The International Air Transport Association, with headquarters in Canada, represents some 230 airlines, covering 93% of scheduled international air traffic.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.