Which FF programs (if any) permit open jaw FF awards? I have miles with US, NW, CO, and DL. (Since this is not specific to one airline I am posting it here). I would like to do an open jaw ATL-SVO, PEK or CAN or HKG-ATL. Obviously, availability will be an issue, but is this even permitted in theory? If so, what are my chances of getting in practice?