Easy. First, Delta ain't the only game in town, and just like Emirates Air and SAA they will eventually rescind the ban on trophies. Second, get yourself a good expediter like Coppersmith or a bunch of others and they will take care of thngs. Lastly, and cheaper, have your trophies shipped by sea. Lots of folks do it.
This. My taxidermist here in west Texas works with a broker (don't recall the name) used by many many US taxidermists... might be Coppersmith, I don't recall... anyways, they were saying that lately they're using container ships for much of their shipping. Slower than air freight, but cheap and climate-controllable.
