Towards the end of WB2, there were 300 players or so in the S3s, regularly. As I remarked, it was straining what the arenas could handle to teh limit. So much so that the last few S3s prior to WBIII actually had staggered start times for squads, each squad generally only being allowed to fly for two hours (exceptions being bombers rtbing; so long as they returned before frame end, that was OK).
If there were any S3's in WB2 that had as few as 150 people in whilst I was flying in 'em, it must have been early on in my S3 career, when I wasn't as aware of the overall picture. IIRC, the Axis numbers were alyways in three figures, and we were nearly always handily outnumbered by the Allies.
The IMPORTANT point, though, is that it was a quality event which was started by a couple of squads (JG14 and, I think, Daddy's FG, 52nd?) and attracted more and more people because of the quality of the event. Bomber crews loved it because it allowed us to do what we like doing best the way that we like doing it (buffing is a "long", game, as compared to fighters being a "short" one).
There is no reason why AH cannot have events of similar quality. I know that the CMs have certainly been trying to improve things, but I think that part of the problem has been a failure by large chunks of teh community to appreciate just how different the bomber side of things to the fighter side, and that accomodating what is good for the bombers only means improving things further for the fighter side (If more buff pilots are having fun, there;s more buffs to shoot down, right?). Some seem to think that because the fighters are more popular that it isnt worth expending much energy on the buff side, but that just creates a vicious circle which ensures that buffing won't be much fun, and so few will want to do it. It's a short-sighted view which makes no real sense any way that you look at it
Current AH is generally something like WB2+ (major negative with AH being fuel use/management, ever-present GPS, and some oddities in the FM (I've never been convinced about the accuracy of the axial inertia in AH - but then that isn't such a big deal to bomber pilots). It looks as if AHII will be providing even more in the software for us to play with. Well and good - so it's down to the quality of what is DONE with the software, and as some past games in both AH and WB have shown, well-organised games can help transcend some of the limitations of the software to produce truly outstanding game experiences.
As I;ve said - I have not been present in Squad ops for quite a while, therefore I cannot comment on them directly. But I hope my contributions here have helped promote ideas which can improve things all round for everyone.
Esme