Siren sound for airplanes bugged ??

[AlBoulcan]

I am sorry if that's been asked before but haven't found anything about it, so here it goes.
As you all have noticed when you spot an enemy airplane there is a siren sound that alarms you that there is incomming airplane. Thats great, but there is one problem.in 1 v1 you hear the sound everytime, but In 2 v 2 and above sometimes you hear the sound sometimes you don't. It has anything to do with which unit spots the airplane 1st? or its bugged? i mean since this feature is in the game you should hear the sound everytime an enemy airplane appears but thats not the case it seems at least on team games.

 

[potski]

It would be very distracting the more players there are, if you heard the siren everytime any of them sent out planes, even if not in your sector. I assume there is some mechanic to judge if they are a potential threat to your forces?

 

[AlBoulcan]

there is not any mechanic to judge the threat...i mean sometimes you see enemy bombers almost right above you and you haven't hear any sound. I was starting to get used with this new sound mechanic on 1 v 1 but in team games its a problem because in most cases your division is sound depended to react on enemy planes before its to late.