Probably up to 4 metres square.
Not as big as the average toilet in a house.
Is a weather airplane
a typical master bathroom is 15X17. depending on tub size.
I would just tell her, the bathroom's at the end of the plane.
Not in a typical airplane engine, however if you had a specially made modified engine, than it is feasible.
first you have to eat a donut and then you draw a donut and then you go to the bathroom
There is no such large airplane so far and such large ones will be necessary and impossible
several million USD ($)
About the size of a typical house bathroom
D-a-m-m-i-t Janet
they store and then dump it over the ocean Somewhere.
It goes into a holding tank and gets pumped out when the aircraft is on the ground.