I still think that Lan broke through an Air weave which was woven by the Black Ajah when they confronted Nynaeve. He staggered and kept on running. They no doubt didn't have enough time to weave a proper barrier considering he moved so fast, and thus managed to break the weave before it has properly formed.

Weaves do exert a finite force no matter what anyone says. If Air barriers were infinitely strong then why did it take so many Aes Sedai to create the barrier to fend off the Shaido? It would be helpful if one Aes Sedai could encircle the whole area but clearly they couldn't and needed a combined effort. We've also seen the Aes Sedai link to a circle of 13 when they thought Sammael was attacking Salidar, and they said they could stop a 'herd of charging bulls'. We've seen that lightning strikes barriers and needs a certain amount of strength to resist it. It may be power-wrought but it is more the product of a weave than a weave its self, and can kill Mat despite his medallion. Thus Rand, and later Cadsuane describe needing a great deal of the Power to deflect the attack.

I'm quite sure an air barrier is the same. An average female can probably deflect an enormous force, so it would take incredible force to break it - maybe too much for any man. But it is possible, and I think it's been shown already.