That would be wonderful..
Though I suspect intra-city airships as are being asked about here would sooner be on separate flight paths, with others going between cities. But still that would be absolutely amazing and I'd love it to bits.
I'm pretty sure Ragnarök Online intended to do the same; the airship there has a below-deck casino. Buut.. their server's location has laws against gambling or something and they had to pull the mini game from the international release, I think >.>