Bathrooms on an airplane are often small, and include a small toilet, sink and paper towel and soap dispensers. Any waste from the toilet is stored in a special tank on the airplane which is emptied after each landing.
Flight crews call them "Lavs"- short for lavatory. Naval aviators still call them the "Head".
It depends on the type and configuration of the aircraft.
The ideal configuration for an airplane is the one that lets it perform its intended mission in the most effective manner. There are hundreds of different airplanes; the ideal configuration for an Air Tractor crop duster is far different than the ideal configuration for a Beech King Air 200 business jet. And the ideal configuration for an Airbus A320 is different than the ideal configuration for a Eurofighter Typhoon.
flying airplane in clean configuration
flying airplane in clean configuration
525 people in standard three-class configuration, or up to 853 people in all economy class configuration.
Of course it depends on the airplane and the seating configuration. But the largest commercial airliner in the world, the Airbus 380, can seat up to 853 people.
The boy's lavatory had three urinals and two toilet stalls.The girl's lavatory had five toilet stalls, but girls do not use urinals.A pipe burst, flooding the lavatory floor with hot water.
During the middle of class, she asked the teacher to use the lavatory.
In airplanes the bathroom is called a lavatory. Some have them and some don't. Usually small personal airplanes to some small commuters don't have toilets. The planes that do have them, their location varies by interior design. If you would like to know the location of a lavatory in any particular airplane you have to reference the layout chart of that particular aircraft.
Lavatories
no bathroom