Occupied
A hy-pot-en-use.
They can. Their restroom may be broken, dirty or occupied.
Lavatory
NO! Absolutely not! If it's not allowed in the plane why would it be allowed in the bathroom?
An Airplane =)
If you need to then call for somebody. not call somebody yell for somebody. that's what I do.
You call an airplane driver a pilot.
The recommended heights for the nurse call devices in restroom
Possibly in the pet/cargo bay section; but not the part where you get on & are occupied in.
airplane mechanicpilotco-pilotcaptinair hostessmanagercook
It is avion