You need to install Tweaks
for having additional aircrafts support and then subscribe to this Workshop Item:
Have in mind that those additional aircrafts will raise the VRAM you need for starting the game, so decrease the numbers of airline mods you have activated…
===Updates===
American Eagle
Berry Aviation
Ravn Alaska
Deixei apenas uma cia aérea ativada e nao consegui carregar o jogo . Isso é um problema? Limpei todos os mods , so estao ativados o mod da varig o tweaks pack e o code base
Does it crash? May be the known memory issue, how much memory do you have?
===Air Namibia Update===
Cyprus Airways
Airlink
Bahamasair
improved ATR MDK from the ACEO Modding Group now available
—coming soon on next Tweaks AircraftPack Update—
- better engine position
- flipped door positions (with some small issues)
- ATR42 Freigther & ATR72 Freigther
The new MDK is working on tweaks and non tweaks mods and vanilla or old mods will not have any change
And here you see in action with
Aerogaviota (ATR42) and EWA Air (ATR72)
That ATR improvement is causing lots of updates on my site. Keep an eye on the latest updates on Steam if one of your subscriptions is part of it. 
===Update Conviasa=
===Skywork Airlines Update===
===Updates on Mods with missing DO328 included===
==Central Mountain Air==
==South East Asian Airlines (Seair)==
===Zimex Aviation Update===
==New Contract Zimex Austria (Cargo, tweaks only)==
===Amazon Prime Air Tweaks Update===
Requires Tweaks cause of no other aircrafts available
The defunct Sky Airlines would be an amazing addition for Airport CEO with it’s different coloured tails.
More information about the fleet and the different colours can be found here:
https://www.airfleets.net/flottecie/Sky%20Airlines.htm
I was confused with the one from Chile, we will add it to our list 
Sadly only 2 modders active atm so may take long…
