Soros has/had a stake in both AMR (AA's parent co.) and UAL (as of spring 2002 he had 3.5% stake in UAL).
From what I'm picking up in googling, those were the only 2 airlines which had stock shorted in the month leading up to 911 (I'm not saying, to be clear here, that he was behind it, but it's interesting to speculate on this).
One link I read stated that the money made in those trades remains unclaimed. It's about $5 million worth, and that link stated that it was considered "chump change" so my guess is a major player would not want to risk it by collecting this.
From this link from 22 Sept 2001, this was interesting:
http://www.sfgate.com/cgi-bin/article.cgi?file=/chronicle/archive/2001/09/22/BU27558.DTL
"Still, anyone shorting shares of AMR and UAL would have turned a strong profit. UAL closed yesterday at $17.13 per share, off 44 percent from its close of $30.82 the day before the attack. AMR is down 40 percent, closing at $17.90 yesterday from $29.70 on Sept. 10."
And from this link 18 Sept 2001:
http://www.sfgate.com/cgi-bin/article.cgi?file=/chronicle/archive/2001/09/18/MN63703.DTL
"Using what is known in the options trading industry as a "put," investors bet heavily against United's parent, UAL Corp., on Sept. 6 and 7, and against American's parent, AMR Corp., on Sept. 10, in the three trading days before the attack. Put options are essentially market methods for profiting when an investor believes the price of a security will drop.
"No similar bets were made against the stocks of any of the companies' major competitors, including Delta, Continental, Northwest and Southwest. That would suggest that the investors had specific reason to believe UAL and AMR shares would drop."
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Another interesting link, re: a Chinese airline:
http://64.233.167.104/search?q=cache:Nv65FGPF5nkJ:www.portfolio.hu/en/tool/cikk-next.tdp%3Fi%3D674+American+Aviation+Ltd++soros&hl=en
"The largest shareholder of Hainan [Airlines] is American Aviation LDC, controlled by the Quantum Fund of Hungarian-born international financier George Soros."
Did you come across anything about puts being put on the stocks and not cashed in yet?