What is painfully obvious as much as some people want to argue otherwise is that AA had a cost problem relative to DL for at least five years and in that period, DL has had a field day targeting AA's top markets.
<snip>
It is precisely because DL's costs have been well below AA and UA for so long that DL has been able to gain so much revenue.
I agree with much of your post but I just had to highlight these parts. For many years, the employee-posters here have argued emphatically that AA did NOT have a cost problem and AA's bankruptcy was merely the product of "mismanagement that flew AA into the ground." That's a paraphrase from the pilots' and FAs' union leadership talking points and a paraphrase from hundreds of posts on this forum for the last several years.
And some blowhard ignorant A-holes will probably jump on the above and conclude that I "hate labor" and that I'm "anti-union." Nothing could be further from the truth. Anyone with the ability to read financial statements can see that AA's labor costs were higher than the competition.
The professional "analysts" like Jamie Baker, Ray Neidl and Helane Becker and the rest of them had no difficulty seeing that AA's costs were higher than DL or UA following their mergers. Lower cost airlines tend to grow and higher cost airlines tend to shrink, and AA's been in that higher cost category since at least 2006 (when NW and DL lowered their costs). Little wonder AA contracted as B6 (a very low wage airline in the beginning and still lower than AA post-bankruptcy) expanded rapidly at JFK and BOS.
And, as you point out, DL has grown at AA's expense since its post-bankruptcy merger. 2012 marked the third straight year of huge profits at DL (more than $1.5 billion pre-tax. pre-profit sharing profits in each year), resulting in $950 million in profit sharing plus another couple hundred million in performance-target bonuses for rank and file employees over those three years.
AA went from being a very high-cost airline to being a slightly lower-cost airline once the merger-related payraises take effect. Lower enough to enable AA to thrive and avoid another Ch 11 filing? My opinion is no.