One other thing to note, at DL, "Green Slips" are premium pay trips. A regular line holder gets 2x pay for a GS, but has to meet a "trigger", which is not less than 67 hours of credit per month before it will pay double (and the trigger could be higher). In effect, unless you have vacation in that month, you have to work a full schedule before you get the 2x pay. However, on Reserve, a GS pays 1x on top of the Reserve Guarantee (between 72-80 hours of pay) if done on your days off. But critically, you get "payback days" where you get those off days "back". IOW, you are not working "extra" to get the premium pay on reserve. My understanding is that at SWA, that is not currently the case.