To transport chocolates on a plane without them turning into a sticky mess, you should always pack them in your carry-on luggage rather than checked bags. The passenger cabin is climate-controlled and significantly cooler than the cargo hold, which can reach extreme temperatures during ground loading. For added protection, wrap the chocolates in aluminum foil to reflect heat and place them inside an insulated thermal bag. If you are traveling through exceptionally warm climates, you can include a small, solid gel cold pack (which must be completely frozen when passing through TSA to avoid liquid restrictions). Another professional tip is to choose high-cocoa dark chocolate, which has a higher melting point than milk or white varieties. Finally, avoid placing your bag near the aircraft's wall or floor heaters, and try to keep the package tucked away from direct sunlight during your transit to and from the airport.