We put ours in game bags, then double bagged it in contractor bags. Then into 20 gallon totes until it was around 100 lbs. Set it out side (it's cold on Nunivak in Feb) to freeze until we flew out. When we put it on AA air cargo in Bethel, they told us it would go in a freezer in Anchorage and in Seattle on the ride home. In Chicago they only had a cooler but when we picked it up, it was still frozen. The ride back to Michigan in the back of the truck saw temps in the mid 50's, but it was still almost totally solid when we got home after a 7 hour ride.
When you ship air cargo, they can tell you what the conditions are at your destination airport. Some have freezers, some only coolers, and I would imagine some have nothing. If that's the case and it is in warmer climes, you obviously would wanna be there as soon as it arrives to pick it up.
And remember, it needs to be thawed to process when you get home, so we where fine with it being slacked out a little on the trip.