Really? I didn't hear that. That would be significant. It means the hijackers' real beef is that Americans interacted of their own volition with Kosovar Moslems while standing on their feet instead of lying on their bellies.
Al Qaeda recently released the "Martyrdom Videos" of some of the hijackers. In them, at least two of them list the US intervention (on their FReepin' belhalf!) in Kosovo on their list of "grievances".
Logic is not the strong suit for these morons.
But, then again, how smart were we to be intervening on the behalf of Islamic A$$hats in the heart of Europe?