Ms. WORMSER: When the volunteers opened the cargo door to go into care for the monkeys, these are the sounds that we hear.

NPR: 65 Little Monkeys Chattering in Maui

But the crash of a Turkish Airlines' DC-10 10 minutes after take-off from Paris in March 1974 put the cargo door problems in a whole new light.

BBC: Dreamliner trouble: A brief history of airliner problems

Soldiers on an airborne Chinook with a bird's-eye view through the cargo sling door take advantage of a few moments "out of the war".

BBC: Return to Vietnam

Global cargo companies make it easy and cheap to ship them door to door.

NPR: Gift Boxes Help Migrant Filipinos Keep Ties to Home