We’re happy to announce that Airport CEO is now available on GOG! Since the launch of ACEO there’s always been to occasional weekly request of being able to get the game on a platform separate from Steam and now you can! 
GOG will always receive the same types of update as the Steam version, we’re currently deploying 1.0-39 on both.
Enjoy!
A little question, how are mods/achievements handled? I know that’s two questions technically, but… 
The Steam achievements have been converted to GOG achievements! As for the mods there are no GOG equivalent of the Steam Workshop feature, however you can still use native mods with the GOG variant.
Ah, I didn’t know GOG supported achievements.
