all of what has been said makes it obvious that US wants to be in a position to go after AA if AA ends up in BK and is unable to defend itself.... UA and DL certainly don't need US, particularly after the LGA/DCA slot deal.
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AA and US would have alot of network benefits, even if west is split off. obviously labor integration is necessary but if AA ends up in BK and has to rework its costs, Parker becomes pretty free to set the template for the new airline costs...
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If it occurredd, it would likely be the AA name but US as the corporate surviver.
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but you can look back at the US attempt to acquire DL and realize Parker is not done and realizes that US needs to "bulk up" or get left behind. He learned from the msitakes w/ the DL attempt - the least of which was saying that DL employees would be the target of the capacity that would have to be cut... and that won't be repeated again. Otherwise, there is more than a remote chance that Parker will show up in AMR's BK courtyard if they end up there.