ive been playing openttd for quite a while now so im not totally new to this type of game, but i am new to simultrans. last night i tried to place an airport. i got it mostly figured out. i placed some taxiways, a runway, a few hangars, but i got stuck after that. whenever i tried to place down a control tower, landing lights etc. it would say not allowed, that its an extension of a depot and must be built near one or something. so then i built a plane stop or a loading stop or something like that. it was like some weird concrete turnaround for airplanes and i guess thats the main "depot" building for airports. so after that i could finally build landing lights and control towers but i could only build them directly next to this little depot building thing. in real life landing lights are near the end of the runway facing the direction of approach, but in this game its literally impossible to place them there because they all have to be within a few tiles of this depot. same problem with the control tower and taxilights. have to place them right next to this depot which makes it impossible to place things in the way you need them.

my second question is how do you buy planes. i know in openttd you click on the hangar and buy them there, but in this game it only lets you dispatch them or create convoys or something. i already pressed "?" in game and read the airport section and its no help. thanks!