If you’re at Spirit right now, the best time to leave was 2 years ago.
The next best time to leave is now.
Your airline has a dismal future, and quite possibly no future. Every day you spend on Spirit’s seniority list is a day less you have on your next airlines seniority list. There’s a very real possibility Spirit is liquidated. It would benefit to get out ASAP. I can understand waiting for the merger, but that ship has sailed and your ship is taking on water fast. If you wait till the end, the hiring environment may have dried up and you’ll be fighting for jobs with the rest of your seniority list.
Even in good times the current management there is not your friend, and would fight tooth and nail to ensure you get the bare minimum.
Good luck to all.