Really guys? I am ashamed! Where is the creativity?
Firstly, yes, it's very very possible. The scale an amount of aircraft is in question, but put a prop plane or glider under a zepplin, and huzzah!
What I would do though for this, is use some sort of solar energy and make a craft that isn't using the energy to move that much, but moreso to just float. I am not sure how much energy solar would produce, and it depends on the size of the craft, but I think on a large scale this would work. From there you just put on the planes. I feel at the very least someone should make an ever-floating sky hotel.