Whenever I've flown to Cuba, I've checked"domestic" cigars in my luggage (Cubans come on as carry-on when flying back from Cuba), with no ill effects at all. Yes, JCH is right, it gets very cold in the luggage compartment at that altitude, but I don't think it's cold enough for long enough to do any damage. I have a couple of travel humis, but I reserve those for bike trips or car trips. When I fly, I use Tupperdors and have had no issues what-so-ever.

Just my $0.02 worth!!