For 1 -2 coolers make sure all your meat it frozen solid and pre-chill your coolers the night before with a bag of ice. Before your flight dump the ice and pack full with meat. Any extra room you can ball up newspaper to add some extra insulation. I've flown for 20+ hours and had my meat or...
If you want a great unguided hunt I would highly recommend Isaac out of Bethel, Alaska. He is an amazing pilot. Him and his father flew my buddy and I into a river last fall for our float hunt but he does does unguided drop camp hunts and will put you in some great areas with some giant moose...