"Could this device finally bring a peaceful end to the great arms race in the sky? That's what the makers of Soarigami, a plastic divider that allows air passengers to comfortably share an armrest, are claiming. The device, to go on sale for about $30 in early 2015, balances atop the existing armrest to create an extended leaning platform that prevents the horrors of actual physical contact." - Steve C, Team Marina

But why does it look like an airmail envelope? - Soup in a TARDIS

Completely useless when the person sitting in the next seat has their entire body/torso overhanging the armrest. :/ - Ken Gidley