TSA Screeners stealing
Google above comes up with 750+ mentions, its too bad these stories don't get wider coverage than the local news.
When I travel by plane, (not as often as I once did, by choice) I pack a
Pelican case and let the TSA scan the bag, you have the option to watch it being scanned and in the presence of a TSA agent securely lock your bag with a real lock.
Sure the bag isn't as sexy as my pre-9/11 bag, but its military grade and has a lock hole for a padlock, and I haven't lost a thing to those TSA thieves, many of which I wouldn't even let them walk my dog let alone protect me from threats unknown.