Would not worry about it now , "if" it happened it will take a very long time to merge them ( untd merged with CO in May 2010 AND a A.A. US AIR will take longer ), I do not think us air can get it done , US AIR tried to do same thing when delta went chap 11 ,yes some of the unions say they approve of a take over because, a.a must cut expenses and they will not have jobs , they have not much say in it and they know that us air will also cut and maybe more more. It only depends on how the "creditors" will come out better