Mr AeroMan:
I'll stand by my statement that America West would need to reduce non-Labor CASM, as US Airways would need to do alone as an independent. I will give you the fact that if America West did acquire US Airways (whole or part) that America West would probably actually make a decision, rather than the "wait-and-see" game US Airways seems to play. That in itself would save some costs.
And you are right. Given the shorter stage lengths of US Airways, combined costs would increase, and presumably RASM too. Also, US Airways penetration of high cost markets like NYC vs. America West would increase costs... But, as we discussed the other day in another thread, Southwest's costs, adjusted to Ameirca West's stage length, are 2 cents/ASM less than America West. For US Airways, being 2cents above Southwest CASM, stage adjusted, would be a huge success, but may not be sustainable forever.
If merged as an operating entity, I presume a fair number of US Airways would have to go with the deal. Otherwise, the former US Airways flying would temporarily be reduced or suspended as new enployees are hired, trained, etc. If that occurs, the value of acquiring a functioning US Airways prior to liquidation would vanish. So, I think a fair number of employees would be involved in such a deal. And these employees still discuss whether they came from Allegheny, Piedmont, or PSA (the originals). So I find it hard to believe "they won't carry their past with them".
I think US Airways has some strengths that other carriers might wish to acquire. It also has weaknesses. However, if America West was outbid on a US Airways purchase, chances are that America West would be just fine. So, ok, lets say America West makes a bid for the CLT hub, and sufficient people, planes, and support systems to go with it. Fine. Now lets say they get outbid by CO for the CLT hub. Has America West been materially harmed? No. Would America West been better off having acquired CLT? Probably yes. But if they don't, does it change the world for America West? I don't think so. They would continue to execute their non-merge with US Airways plans, whatever they