Maybe they would add some of the older aircraft like the De haveland comet or the DC 3 or 4 i don’t know how it would work explaining the concept of very old aircraft coming to your airport but it would be interesting to see one suddenly land or have one of these that u have scheduled land at your airport.
De Haveland Comet
https://www.google.com/imgres?imgurl=https%3A%2F%2Fs-media-cache-ak0.pinimg.com%2Foriginals%2Fea%2Ff2%2F4c%2Feaf24c0dbba2526cc7ed7ec6ff94baf0.jpg&imgrefurl=https%3A%2F%2Fwww.pinterest.com%2Fpin%2F471541023461182848%2F&docid=g6alu8mOvldQxM&tbnid=hDWXXXeCDKZpTM%3A&vet=10ahUKEwjNttP1jq_VAhVCYiYKHejnCdcQMwh5KA8wDw..i&w=1016&h=636&bih=971&biw=1920&q=de%20havilland%20comet&ved=0ahUKEwjNttP1jq_VAhVCYiYKHejnCdcQMwh5KA8wDw&iact=mrc&uact=8
Dc 4
https://www.google.com/imgres?imgurl=https%3A%2F%2Fbarrieaircraft.com%2Fimages%2Fdouglas-dc-4-04.jpg&imgrefurl=https%3A%2F%2Fbarrieaircraft.com%2Fdouglas-dc-4.html&docid=TpOJyKaYpNjEGM&tbnid=Zjqljo93yhKH0M%3A&vet=10ahUKEwjj2JSAj6_VAhVDySYKHc0pAeIQMwi7ASgCMAI..i&w=2856&h=2227&bih=971&biw=1920&q=dc%204&ved=0ahUKEwjj2JSAj6_VAhVDySYKHc0pAeIQMwi7ASgCMAI&iact=mrc&uact=8
It would really be a COM(m)ETment(commitment) to add new planes, but if they don’t add them i’m sure the steam workshop will be on it! (Yea I made a pun as my first post on the forums… Sorry i’m just waiting to press that buy button on steam…)
Seems this is my second post not my first… Whoops.
Welcome to the forums catcat71 
I have a suspicion the devs are hiding a plane from us… Thinking something along the lines of an A321, A330, or B757/67
I think there will be a few surprises in the release besides a new plane. I’m thinking cargo and remote stands have a decent chance to be included.
Although i hope you all are right, let’s not hype this too much… I couldn’t stand the disappointment 
Although i hope you all are right, let’s not hype this too much… I couldn’t stand the disappointment
Devs showed us that game is ready to play. It is 99% sure the game will be released in this August so I don’t see anything to worry about.
I know it will release then, but i was talking about the extra features in this thread
I always like a surprise or 2… or 3…
Your right, I can sing and dance all I want after the release
I think there should heavies like the:
A330-200/300
787-8/9
A350-900
747-400
to start of with!
Maybe in future…
But now, a larger stand would be needed, and larger runway as well…
thats true but for some reason in the fees part it says heavy aircraft! I wonder why?
It would be great if the next implemented airplanes would be the following:
Small Stand Aircraft:
Piaggio Aero Avanti P180
Cessna Citation X
Gulfstream G650
Learjet 35
Learjet 60
Falcon 7X
Also those buisness planes could be both GA and commercial flight
Medium Stand Aircraft:
Dornier 328
Boing 727
Tupulev 154
Iljuschin IL-62
Those would add some different looks to the airfield, because all those variations of boing and airbus are of course important and should be added, but in that look from above in ACEO those would look mostly the same ;).
the Boeing 727 has been retired for years now and I don’t think any airline uses it
probably in africa and South america.
edit :
Wiki source : “As of July 2016, there were 64 Boeing 727s (4 Boeing 727-100s and 60 727-200s) in commercial operation with 26 airlines.(…) Also as of July 2016, only Iran Aseman Airlines still operated 3 Boeing 727-200s in passenger service (plus one freighter); all other remaining Boeing 727s in commercial service were used for cargo.”
I don’t think this should be a great problem. ok, it would look odd if there would be historic planes, but as there is no date when the game takes place why not a plane from the 70s or 80s.
an as medley points out there are still some in use
Well, the next additions very much will be A319/A320/A321 (no A318 considering it never had “Sharklets” and the A320 model in-game has such) and further to the existing 737NGs the -700 and -900ER. And CRJ 200/900/1000 (eventho the CRJ700 has CRJ900 capacity #bugreport) and BAE 146-100/300. 
I think, developers should add more small aircrafts than medium aircrafts. Especially alternatives for Cessna208 and DHC6. I am not sure what aircraft models are in use but I am sure this community can list it out