"Closing fields has not been the slightest problem.. but no-one I think has tried to close down a number at once yet. Closest I saw was knights..."
Actually, when we (Bish) finally nabbed F1, it took the closing of multiple bases at once. After numerous failed attempts, we realized that the taking of F1 was indeed going to need a coordinated effort. First to go was the Rook city... completely down to 0%. The HQ was hit right afterwards, and following that were some factories (type escapes me now).
We then split up into 3 groups. One group shut down F13, the second shut down F2. While F1's surrounding feilds were being knocked out, the 3rd group moved in on F1 and made short work of the hangars/ack there. Group one and two then met group 3 over F1 and continued to assault the feild as the hangars and ack regenerated.
By this time, there was heavy Rook fighter defence as they surely knew what was coming. This was the largest fur I have ever seen in AH to date. From my lofty position inna 17, the feild below looked like someone set fire to an ant hill - a bunch of pissed off dots swarming in all directions.
This eventually thinned out due to the hangars being shut down repeatedly, and our 47 was able to successfully get his troops out, finally capturing F1.
This was perhaps THE most rewarding day I've ever had in any flight sim. I can't name names of those involved because I'll surely forget someone, but y'all know who you are

A hearty <S> to you guys. Top shelf all the way and it was such a priveledge for me to fly with you.
This sim absolutely kicks arse now - thank you so much HTC.
And Hitech - I almost shorted out my computer due to an involuntary expelling of beer <everywhere> after hearing your (what turned out to be a)joke about having to reset the arena. Yer just evil

Kudos all involved.