archeman wrote:Well how do you know what your listening to?
Just check out for a moment, this graphic of traffic just over Persian Gulf FOR JUST A SINGLE AIRLINE then mentally add in the other Airlines and then add non-stealth military traffic at various altitudes and then try to imagine your advanced microphones trying to sort out all the various sounds echoing around.

System of systems?
I'm not saying this will work, but...
If you can build a database of acoustics -- a library of acoustic signatures of all known aircraft, if you will -- then build a real-time "map" of all acoustic signatures... simply subtract all the locations of "known" aircraft from sources such as this, then subtract all "radar" contacts of "known" aircraft (e.g. radar contacts of known military jets)... and you are left with a sets of "unknowns" which may, or may not, be stealthy bogeys.
Not saying this would be easy, or in the end be successful, but isn't that how you would have to approach it?
I suppose the first question one would have to ask is if the acoustic sensors are able to distinguish multiple sources from different ranges / bearings. If not, then the problem just got a lot harder.
Take an F-16, stir in A-7, dollop of F-117, gob of F-22, dash of F/A-18, sprinkle with AV-8B, stir well + bake. Whaddya get? F-35.