Good question, but don't get myopic. IPA has crews that sit Hot all year long, guess what, they don't log that many hours, but they log alot of 'alert 30' time. Supes are like that, when I was hired, UPS carried alot more reserves to manage the contingency end of the business needs. Way much less since they have figured out the other airline takes care of that requirement with fewer non union pilots. Brilliant actually. Kudos to UPS for taking advantage of our reticence in the IPA.