Originally Posted by Tropical

At Delta, a "GS" ("Green slip") is a trip that the company chooses to cover from a list of pilots who have volunteered for premium open time. It pays 200%. They are assigned in seniority order, from an app that calls you. If you're eligible, you get a call, then check the app and indicate if you want to do it or not. The most senior pilot to accept gets it. Once you've had #1 for the month, every other eligible and legal pilot for the next one available gets a chance before you. Same goes for #2, #3, etc, but it's not uncommon to see people get several a month if they were the only available and legal pilot for that trip.