It could be great fun and it cold be a reason for people to try and get flying vehicles.
STLYE:
Now i thought a kinda bespin sky city with some Megeto type buildings but thats open to suggestions.
LAYOUT:
Layout is realy dependent on how big it could be(most likely more town/village than city) . It would ofcourse have to have a hanger to land on/in. It could be a space style hanger that you land in or it could be a platform type thingy like th ones used in the bespin level in battlefront 1 that I can not remember but where you fly around, I think its called mining faciltie or something like that, Why not both?
Now for what else would be in the city is for you to decide. personaly I thought a cantina or some kind of chat bar thing, maybe a zone just on the edge of the city which is split up to have a dogfight arena and a Sky race course-there was aan old game called crazy planes if anyone can remember witch was sky based but had lots of small obsticles and tight squeezes-this might require some sort of barrier and some tricky LAU to stop people blasting eachother and the people walking about on the city, maybe you could have a small shooting areana?a bit like the turrets in space you go into a seperat room and there are two diferent set of control seats one is an enclosed areana witch will sporn flying droid targets of varying speeds and the other set of sets will open ont a small battle arean with people vehicles and turrets to provide a battlefront expirance,a possible is that there could be a docked ship not a captal but a frigat kind of thing which could have some monster things in its hold and some battle arenas maybe missions could be given like in the Spira:Besaid map
, the rest is up to you what do you want it to look like? Or do you think its a rubbish idea to be spat upon 
?(one small thing I was thinking open plan with some closed up buildings as oposed to fully closed up like a capital ship)All these ideas could be included on the groung is you decide that the sky city is a bad idea.Please comment and tell me what you think?
Edit: Just a note to pplz, Fiodis is considering doing a Cantina in the Sky Because a Sky City would be to big and to much of a tax on the Object count. Now this thread is ,more about a Sky Cantina and stuff like that.
(I know him on Xfire so I've got the privilege of calling him that. 
) and what Tean said from the Underground City topic. I don't think we should go totally mad with stuff in the DMI, not that it should be small and simple, but we shouldn't add endless stuff.
