Spirit
Last month I saw a trip in O/T that started a day before my original trip. Called sked, since the report time was in a couple hours, and told them I'd do it for $$. They pay protected me for my original 11 leg, 20 hr 4 day and gave me 200% for the 5 leg, 25 hr credit 5 day pairing they created. Went from 80 ish hours credit to north of 130 for starting one day earlier and working only one more day. I think it was worth it. I've only been on the line for a few months and it appears that JA's (5 per year) are more voluntary than anything, all subject to change of course.