Nope, no ragrets. There is a picture of me floating around the internet with that tattooed on my chest.

Even after all the dust settles, it will still likely beat regionals or 9-5 white collar jobs for money/QOL ratio.

These Recalls will be temporary I anticipate attrition to slow right down after Q1 as it did last year. Unfortunately those returning could be getting re-furloughed in October once we reduce the fleet again

Slow, but not stop. Lots of folks waiting on UA and AA classes. Once they force more people into commuting, attrition skyrockets again.

Whoa. About the only thing the airlines say they WANT is 1000 hrs TPIC ('highly qualified') and 500 hrs TPIC ('competitive'). Left unsaid is multi-engine TPIC. #2 guy at a major - "not Caravan or PC-12 time...please."
There's no requirement to have 121 time. Is it better than 135? Yeah, they like it a tiny bit better but the BIGGEST thing they like is MEL TPIC. Period. Leaving a jet Part 135 PIC job to go back to a 121 FO job is not a resume enhancement.
Back in 2014 or 2015 a regional FO was coming up on his regional upgrade. Asked me if I thought he should take the 747 FO job offer he had instead? I said take the upgrade, it's the only criteria that they've specified get TPIC time and experience. But I walked over and asked the head of AA pilot recruiting and she said "we don't give career advice. That's up to them." Got it. I started walking away..."but you're giving good advice."

I agree with what you are saying, I already have the TPIC to be highly qualified, problem is it is in a 14,000 pound Citation, tired of flying 3 hour legs in a small cabin with no lav to use. With my times more time in heavy aircraft, I feel will continue to round out my resume, but I hope Spirit can make it and I never have to leave.

I agree that it might be foolish to leave a TPIC job to sit right seat at NK. You may get furloughed again shortly after coming back. If you have TPIC to be highly qualified, why aren’t you looking elsewhere? Everyone is hiring. Just my two cents.

They accept single-engine turbine time only because many fighters have one engine. If it's not a pointy-nose fast mover, you need to plan for some ME time.

You mentioned that you'd "come back" to Spirit. So you've already been there, got an A320 type rating and Part 121 training on your resume? I don't think there's any resume 'bump' points for getting more A320 FO time. If you already have 1000 hrs TPIC in your log book you're more flexible on your job decisions. The next resume bump is Part 121 PIC. I'd guess that's a long way off at Spirit. If you're relatively young, and still chasing the big 121 airlines, I'd map out my resume progression at your current job, taking the Spirit recall, and getting a regional FO job that has a fairly quick (2-3 yrs? Is that still happening??) upgrade. Make realistic assumptions for 2, 3, 4, and 5 years in the future. See if prefer one future resume over the other options. Tough to figure out the bouncing ball. Good luck.

I didn't realize we’d hired a psychic. Since you’re so confident about the attrition rates and the October schedule, could you also let me know the winning lottery numbers? It’d be nice to have a backup plan for when your 'reduced attrition' theory inevitably changes again by May.