I know that the PHL vs JFK debate has been gone thru several times here, and I still say that there is enough traffic to support both cities.
People who live in the JFK/NYC area don't go the PHL for international flights, and the PHL crowd doesn't go to JFK for theirs. I could see this logic applied if we were comparing JFK to EWR given they both can draw off the same traffic base, but PHL doesn't.
Both PHL and JFK markets are sufficiently independent of each other to be kept and operated seperately, just like EWR and IAD for UA. I wouldn't consider PHL's O&D to be "awesome;" however, it supports the operation at its current size with potential for growth. Facilities are the contraint for growth in PHL, not the O&D traffic. Combine this with a potentially AA controled CLT and MIA added in and you begin to see the real value US brings to AA and the threat to DL. Will it put DL out of business? Absolutely not!!! Will it be formidable competition? Darn tootin'.
There's way too much overlap between DL and US for any reasonable consideration of a merger. So why then did DP's merger attempt with DL make so much sense several years ago? The answer is the difference between two reasons for merging: competition back then (competitors) vs. revenue now. A competitor would have been eliminated (capacity reduction). Back then, the airline industry was suffering from too much capacity (too much supply and not enough demand). The overlap of flights betwen DL/US would have taken a tremendous amount of capacity out of the market, but at the expense of labor/jobs. This, I believe, was the real reason for not getting creditor approval at the time...too many jobs lost, too much capacity dumped, and way too quickly.
Today, capacity reduction is almost complete; as evidenced by healthy load factors industry wide and growing profit margins. However, this is a mature industry; meaning there's little room for growth. Investors demand year-over-year growth in the returns on their investments. To acheive this expectation, companies need to grow profits. Cutting costs and growing revenues are, basically, the only two ways to do this. Cost cutting for airlines has been done using the bankruptcy process. Growing revenues has been done through all of the new ancillary fees, but that revenue stream is basically maxed out. What's left? The only real solution left in this business is to buy up another competitor and their revenue stream. Of course this only works if the two cost structures are compatible (AA in bankruptcy and I'm betting DP is working hard to ensure the numbers are right and he's a part of AA's POR).
Could AA grow on its own? Absolutely and it would be the most labor friendly way to do it, but that's about it. Just exactly how is AA going to grow sufficiently (on par with UA and DL) without putting capacity back into the market and returning the industry to its original troubles? How is AA going to overcome the constraints of facility aqusitions (gates), slots (NE), and many other barriers to entry needed to do this? Some say at the expense and demise of US and AA is the one to do it. Ok, maybe so, but to do this AA still needs to overcome the barriers to entry inherrent to this industry to be succesful. Airplanes aren't the only asset necessary to put a competitor out of business. I know AA has a gazillion on order, but AA would also need gates airport facilities, and slots up and down the east coast. There's also a time factor before AA could claim victory. US now has "some" staying power in this industry and growth along the east coast will also meet resistance from DL. It's their backyard too...not to mention SW. Combining AA and US combines revenues more quickly while avoiding more capacity into the industry. Wouldn't it be quicker and easier to combine two "turn key" franchises and merge the operations? I know from a labor perspective the answer is a resounding no. And, most posters here are labor. ('nuff said about that) However, from the boardroom perspective and so long as the numbers work, the answer is yes, it is easier and is why so many "interested parties" are hiring investment bankers to do due dilligence on all the options.