Board Thread:Questions and Answers/@comment-24.62.142.87-20140331201702/@comment-80.202.28.145-20150123094205

Esvald Forceswoop wrote: SAO must have magic. Aincrad is floating in the sky and I did not see any repulsorlift-technology in a medieval themed game. It must be some kind of magic. However there is no magic that players can use. That doesn't need to be magic. Maybe the gas outside Aincrad has massive density. about same metals, and therefore the air inside Aincrad would lift it up like a balloon. It didn't fly even higher because where Aincrad was the amount of this heavy gas wasn't as great as lower in the atmosphere.

You may say this is impossible due to the fact that Kirito and Asuna could still breath normally while being outside the Aincrad after they "died", but they are looking down on the now collapsing Aincrad. Maybe the amount of the heavy gas is about nothing up where they were. And also when the Aincrad collapses all the parts falls downwards, presumably against the world beneath since they are no longer held up by the light air inside the Aincrad.