Yes. It shouldn't be a problem with ULCC #2 because they already screened you and you can just tell them why you left if they ask and it should make sense to them.

If you ever apply to a legacy, then it will be a flag for them. You should be able to explain it away, backed up by the timing assuming that you start at ULCC #2 quickly (as opposed to eight months later).

If it were me, much under age 60, I'd probably stick it out and get the type. That way you also have less of an air gap in the event #2 stops hiring, or something bad happens with the industry, which we all know can develop in a matter of days or even minutes. Depends on your personal situation though.