airlineair·line /ˈeəlaɪnˈer-/ noun [countableC]ORGANIZATIONSTRANSPORTTRAVEL an organization offering transport by plane for passengers and goodsIBM is an IT supplier to most major airlines world wide.
It is considering operating as a charter airline (=an airline whose planes can be hired).
It had to restructure its business, as no-frills airlines began to cut into its profits.