This is my first time needing to return a rental car in vegas. I have a funeral that I have to go to, on short notice.. so I figured that I would drive to vegas in a rental car, spend the night and fly out on US airways and get to BOI where I need to be, then fly back to vegas on Allegiant, and then fly southwest home, after another night in vegas.. SO when I get to the airport, where and how do I return the rental car? How long will this take at 5am? I have seen the lines to get to the rental car place, but never to return them.