If you go under marketed block you get paid historical credit. Sometimes this is more than scheduled block and sometimes it’s less. It’s a number the company comes up with by averaging all of the block times for that segment over the year. So scheduled block might be 1:45. Historical credit might be 1:35. If you fly it in 1:20 you get paid 1:35. If you fly it in 1:40 you get 1:40. If you fly it in 2:25 you get 2:25. So it’s “historical credit or better” not “block or better”.