An airplane lavatory is a small bathroom or restroom found on an airplane, where passengers can go to use the toilet or freshen up during a flight. Full definition
Most Creative: «15th - Century Flemish - Style Portraits Recreated in Airplane Lavatory» and «Dad Takes Crazy Photos of Daughters» (rachelheldevans.com)
From dirty seat pockets (which aren't often cleaned despite being depositories for used tissues and gum) to the dingy surfaces of airplane lavatories (the suction created when the toilet flushes throws a fine mist into the air), he argues that there's more than enough harmful microbes on board a plane to make even non-germaphobes squirm. (macleans.ca)
Sick or not, consider carrying anti-bacterial wipes and swiping them across the tray tables, door and sink knobs in airplane lavatories, remote controls (in the hotels too!) (travelinsurancereview.net)