I think Delta also has some sort of clause for being released from your remaining RSV days once you reach guarantee. Other carriers have similar restrictions. Back in my regional days, once you went over guarantee, you were retroactively paid min daily credit for every unused RSV day. (And we even thought that was a rip-off because we shouldn’t have had to break guarantee to get paid that way!) Sometimes breaking guarantee by one minute could mean an extra 20+ hours of pay. Breaking guarantee at UAL is comparatively useless. Straight pay for hours flown & no extra days off.