When traveling by air, it's common to hear bells, chimes, tones, whatever-you-call-them over the speaker system. It seems like a single tone is just a passenger pushing their call button. But what do the other ones mean? Are they unique to each airline, or are they universal country-wide or world-wide?
Right, firstly according to Airliners.net forums, each airline has different chime meanings.
However, on Yahoo, we have a list of all of the chimes - but presumably it's for a specific plane, and it doesn't say which:
Generally they are as follows:-
This is confirmed again on Airlines.net, where they show that for Canadian Airlines it's as follows:
The same forums have another page with information on NW, Continental and others, so it would certainly seem to vary from company to company.