Where is the toilet on the plane?
BA-gno — stress on first syllable. The 'gn' is a nasal 'ny' sound.
At any point during the flight when you need to use the lavatory.
'Bagno' is the standard Italian word for bathroom/toilet. 'Sull'aereo' (on the plane) is 'su' + 'l'aereo'. Lavatories on aircraft are usually located at the front (galley area) and rear of the aircraft, sometimes both. The occupied/vacant light indicates availability.
Il bagno è libero?
Is the toilet free?
Check the light — green means vacant, red means occupied
C'è la coda per il bagno?
Is there a queue for the toilet?
Ask the passenger in front to judge waiting time
Posso usare il bagno adesso o stiamo per atterrare?
Can I use the toilet now or are we about to land?
Toilets are locked for the final approach to landing
Aircraft lavatories (lavabo or bagno) are typically locked during taxiing, take-off, and landing. The seatbelt sign is usually an indicator — when it's on, remain seated. Flight attendants will remind passengers to return to their seats for landing. The lock shows 'libero' (vacant/free) or 'occupato' (occupied).