With latest update 02 August 2019

[Deleted member 9675]

Free2Play

Its greatly appreciated with the new sound effects when hovering from over the city, to the airport and the production area.
However the planes now landing and departing are silent

 

[Free2Play]

Thanks. Luckily that's one of the few things we can fix remotely!
Please launch your app with Wi-Fi, wait a few minutes and relaunch it after that, the sounds should be back.