The obvious delta is the pay rates. Neither allegiant nor a regional should be a planned final destination. If you can live on allegiant pay for a year i would suggest you ignore the 2024 pay and think about what you can be making in 2034

I don’t know the allegiant training pipeline, but the regionals are having trouble. They lack captains. Hiring more FO’s makes the problem worse both by bloating payroll but also diluting the flying FO’s need to reach 1000 hrs (and eligibility to upgrade). Because of this, regionals 1) aren’t hiring fo’s, or 2) are hiring fo’s very slowly 3) are prioritizing captain upgrades and introducing long training delays for new hires 3) may have very little flying for reserve fo’s. The regional industry just isn’t a reliable source of quick, quality time accumulation anymore.

There’s also the issue of Allegiant selling its own tickets. G4 isn’t going to abruptly shut down one day because someone turned off the subsidies. That’s a substantial risk to any regional carrier.