Yeah this industry is a constantly changing mess. 2 years ago PSA was the prom queen and endeavor was the f..funny girl, now not so much. Trying to plan more than 2-3 years into the future at a regional is pretty futile, which is why I don't put too much stock in a flow agreement.
My personal opinion is that republic and the contract will survive the BK, but keep in mind we are all just a bunch of barracks lawyers here pretending we know something.

If you're not overly concerned about the money or career progression then PSA may be a good fit. CLT is a hub base for AA so an easy commute and PSA does have good schedule flexibility once you can hold a line.