Why You Will Hear Birdsong From Now on in Plane Toilets

Why you will hear birdsong from now on in plane toilets

One flight attendant said it 'definitely catches people by surprise the first time'

Airplane toilets are making an odd new sound, flight attendant says

Esther says the noise is now found in more and more in-flight lavatories

Flight attendant explains weird new noise in airplane toilets - The Mirror

You may hear it if you try the facilities when you fly this summer