The parking lot (and maybe some others) shuttle busses run between terminals, but given their frequency or modest lack thereof, I'm not sure that you could count on getting to Delta and back with any time left to realx. DL's presence at MCI has diminished to the point that I wouldn't expect much from the club. MCI is a sort of empty place on the prairie, its terminals poorly designed for use in this High Security age, and its traffic never reaching expectations. I get depressed there...