get on the PA
Do you call the announce system on an airplane "PA"?
Is a "PA" used in other public transportations? e.g. The train conducter got on the PA to announce the next stop.

Question

get on the PA
Do you call the announce system on an airplane "PA"? 
Is a "PA" used in other public transportations? e.g. The train conducter got on the PA to announce the next stop.

Answer

Yes, you can call it a PA. It stands for 'public address.' PA systems are not only found in airplanes but as you said, in buses and schools and churches as well.

Answer

-> Tannoy = type of public address system.

Announcements made over a tannoy are sometimes indecipherable.

PA announcements can be difficult to follow in another language.

PA is fine.

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