Would this SFX collection be valuable to you?:
International Airports ambience with walla and intercom announcements where possible.
China, India, Europe, UK, US, Australia, Russia, Japan, South America, Central America, the list goes on...
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I personally have not come across the need for these sounds in my projects so far, but it is certainly the type of thing that when you need it quickly it would be a big pain to get, so I bet it could be useful too many people.
This library is already out there http://www.soundscalpel.com/soundeffects/pack/airport-internal-ambiences/ Again I don't have it so I have no review as to its quality, but there is lots of room to cover more and varied airports worldwide.
I would say go for it.