You'd think that given the amount we (as The Team) travel, that we'd have things pretty much figured out, and there wouldn't be any surprises.
1. Don't bring ice packs -- unless it's for medicine or breast milk
On our last trip to Chicago, we traveled as a family -- meaning our 2 year old was in tow. For the 4 hour plane ride I packed a cold case with her lunch and snacks, and to keep it all fresh I also included 2 ice packs. That was a no-no. Both ice packs were confiscated.