Similar "Early Release" system at Spirit. "A reserve pilot will automatically be released six hours prior to the end of his bid RAP on the last reserve day in a block of reserve days."

Any provision like this at Frontier?

Not unless you're long or medium call. Don't expect to get released early as a short call. If you're an AM reserve you can usually count on getting out an hour or two early but as a PM they often won't let you go early, even if it's to commute on the last flight operating out of base that evening.

Delta reserve is pretty good, and similar to the previous JB description. We have many pilots who could be fairly senior lineholders who bid reserve because they like the reserve system. 12-15 days off per month, depending on how busy your category is. There is no officially defined short call report time, although ~2 hrs is the generally accepted practice. Most widebody reserves do very minimal flying, while narrowbody reserve flying is seasonal. Probably the biggest perk for our reserves is that if you fly on "off-days" for premium pay, you then get those off-days back. Guys in busy categories with decent seniority can use this to get paid 160 hrs for 80 hrs of work during the busy summertime.