Nice! It sounds great, but my only problem is with your last sentence, "the kind of pushback tow truck is selected depending on your airplane weight, the stairs are selected depending on the doors height, below a certain threshold there will be no stairs, etc."
Usually, I don't see tow trucks pushing back aircraft for taxi, like I do at major airports. Can you choose if you wouldl like a toe truck or not? Also, can you choose if you would like stairs or not? For example, the Legacy or BBJ are both big planes. I would assume the GSX stairs would service these planes, but what if you dont want them there? The plane already have stairs built in that it uses. Yes, it is probably above the threshold, but the plane is alraedy equipt with one.
-thank you