Basically an airport where the major airlines (Southwest, JetBlue, AirTran, etc.) fly in and out of. I'm looking for places where the taxi ride is no longer than like 30 minutes to the resort.
Good luck the only places you can get to from a major airport in 45 minutes or less is maybe the big\little cottonwood canyon resorts in Salt Lake City, everything else is at 1 to 3 hours drive.
They normally don't build major airports right next to large mountains or high altitude :-)