^Yeah it is likely that the 75' isn't filling up, although most flights to/from OKC are pretty full during the summer season, but next month with the drop-off in passenger numbers it will be replaced. Still though, with the conditions the industry is in getting a 757 at all for an airport like OKC is pretty good. You're right about the BBJ being the longest-range narrowbody jet, Boeing also has the BBJ2 but that's based on the 737-800 airframe.