Allegiant....now UPS
Hopefully this helps Delta and SWA
http://inside.ipapilot.org/ta2016/video1slides.pdf
UPS has a TA....and the pay scales look pretty good....and value is added to their pension. I'm not an expert on their wants and needs, but this TA was unanimously passed by their union leadership. It doesn't look like they get retro, but they do get a signing bonus.