There's a whole fleet of retired C-141s in storage at Davis-Monthan AFB, AZ. Reactivate the newer ones and turn the mission over to an Air National Guard unit . . .
It could be done a lot cheaper and much more efficiently by rail. Would have to have a few detention camps though. Take a while to get a train load of em. Find a bunch of old auto-racks and you would have three tiers of illegals headin back south per car.