No, my dear, WN isn't a legacy. No analyst considers WN in the same market group as AA, DL, US, and UA - or CO, NW, PA, EA etc before them.
DL did outsource parts of its maintenance in BK but DOT data shows that DL outsources less maintenance than any other carrier except for AA... and when you add back insourced revenue, DL's net outsourcing is about 15% - lower than AA's as well as any other US carrier.
DL filed for BK for the same reason other network carriers did... to restructure their debt. DL converted $4B in unsecured debt in BK into equity and restructured its aircraft leases among other significant non-employee costs. DL employees "paid" a smaller percentage of the restructuring tab than any other airline that restructured in the 2000s, primarily because DL was able to grow revenues primarily thru its in'l growth strategy.
DL obviously didn't need to file for BK to cuts its non-contract employee costs.
DL's pilots lost their pension because of the lump sum retirement feature; AA's BK might be a first if their pilots lose the lump sum feature but are able to freeze pensions like DL and NW did before them.... UA and US terminated all of their pensions, lump sum features or not. WRT to pensions, employees are faring better w/ each successive wave of BKs.
Ask AMR how successful restructuring outside of BK court has been... irrespective of the labor components. Compare the cuts AMR got out of BK court w/ aircraft leases and debt compared to UA and US which were in BK at the same time and it will become very apparent that BK provides real benefits in other aspects of the business besides labor costs. AMR achieved very little w/ respect to the debt and leasing costs outside of BK that other carriers received in BK.
CO filed for BK TWICE and then had a run of a number of years before it merged with UA - at a value far higher than US. And CO employees had higher salaries than US employees.
As much as it pains you to admit it, DL employees have recovered more salary post BK than have any other airline's employees and THAT is the reason why DL moved past its restructuring to rebuilding the company with its employees while many other network carrier employees are still stuck in their BK contracts even though DL and NW emerged AFTER those other carriers.
Just for pilot salaries, look at
www.airlinepilotcentral.com and compare where DL pilots are compared to other carriers. You can look at other labor groups if you'd like but you cannot argue that DL employees have not fared better than its peers at other carriers post BK.
I don't expect you to admit that DL has a superior business plan that has allowed it to reward its employees for giving the company what it needs to grow the company - just as CO employees did after their TWO BKs. CO mgmt decided they didn't have the mass to compete in the world of megacarriers, esp. since DL merged with CO's longtime business partner, NW.
Whether you want to admit it or not, there is ample data to show that DL employees were more productive due to greater flexibility long before BK and that is why DL employees were higher paid, even in the regulated era.
I don't expect you to admit that the historic and contentious legacy carrier labor-mgmt model that has been the backbone of the airline industry doesn't deliver financial benefits for employees on the same level as other models but the evidence is overwhelmingly present for anyone who wants to see the truth.