If you do use one of these BOOK EARLY. I believe there are about 10 seats available per flight and they go quick. My wife and I tried to go fro IAD-LAS last March and started looking 2 months in advanced. The only flights available were IAD-ATL-LAX-LAS to get there with the same route back including a redeye from LAX-ATL. We ended up buying a nonstop IAD-LAS on United for about $250 RT each (Until my wife HAD to take our dog)