What about planes?

I was thinking as ive been playing TT that it don’t have planes, maybe we could have some as a game update ?

another idea…

We could have an option to sell vehicles we don’t want anymore such as the ones we used to build up the empire and replace them with more boats etc to maximize revenue

You can sell vehicles already. Simply remove the driver from the vehicle, and a sell button will be shown on the vehicle in the right hand column.