"The bigger and busier the airport, the less gentle handlers are with our luggage," an etiquette expert told Newsweek.

Theft from checked luggage is not new. The Department of Homeland Security said in 2005 that dozens of TSA baggage screeners were terminated across several major U.S. airports in 2005 for ...

Denver International Airport ... in carry-on luggage. Commercial airline travelers can transport firearms if they are unloaded and packed in a locked, hard-sided case in checked luggage.