Be very careful with the yellow slip. About the only time you should put one in is if you know your going to get used and there is a trip that you would prefer to fly. Putting in a yellow slip for that specific trip is really the only good use for the yellow slip option. If you just put in a blanket yellow slip for the day and you are on long call, you really just put yourself on shortcall because when they call you with a trip it is not a proffer and they don't have to honor the 12 hour callout. Your better off to leave out the yellow slip and put in a green slip. If they call you on a LC day for a trip that reports within 12 hours and you have a greeslip in, you get greenslip pay for it if you want to do it, if you have a yellow slip in, you just have to do the trip. I guess the yellow slip option used to be much better when they had the hi/low stuff before the reserve rules were gutted during bankruptcy. Now it's pretty much worthless.