If you're planning to travel internationally and bring valuable items with you, it's a good idea to register them with U.S. Customs before you leave the United States. This registration serves as proof that you owned the items before your trip...
Keep in mind that any screen protector also reduces the touch sensitivity of the device screen. Best overall solution is to fly from shade, even if just under a golf umbrella that you bring along for that purpose, or under a larger shade canopy...