When you are flying under a Collective Bargaining Agreement your work life is laid out in black and white. Furloughs will only happen in seniority order. You have guaranteed seniority order in bidding for everything. There are rules governing mergers and acquisitions. ETC. ETC. ETC.
If you worried at all about job security over the long term go to SWA. $300,000 is a huge salary by almost any yardstick but if there is a chance of the flight department folding or being furloughed out of seniority order with no right of recall, then that salary is no longer a factor.
Could Southwest fold all together or furlough.....of course they could. But, the balance sheet is the strongest in the industry and a furlough would only touch a small portion of the seniority list with right of recall at the end.
Nothing is a certainty in this industry but if I had to put my eggs in one basket or the other, it seems that the airline basket (not just SWA), is the much safer choice in the long run.