Haven't looked at ULLP pay lately. It doesn't matter because an Airways Capt has higher career expectations than a Spirit Capt. Spirit has only A320 series birds-no widebodies, no trans atlantic routes, a small domestic route structure, or any of the perks a pilot gets from flying for a major.
I think the only career expectations for most Airways capt's (easties) is to make it another year or two til retirement.
Just sayin'