JetSet is an airport and airline manager business simulation game where the player can manage an airport, start an airline and buy planes for the airline, as well as buy service vehicles and build airport infrastructure. The player can also sign contracts with foreign airlines so they can land at the airport. This airport tycoon style game is still in development but a playable demo is available. At the moment the demo has only one airport and some missing features, and may also contain bugs and glitches.
The demo is available here: http://sprotz.itch.io/jetset