Dominator
Like everything in life it's not a simple answer. There are a number of factors such as ( but not limited to) maximum leg length for FJ, availability of correct fuel, willingness of airfield to accept, fuel/payload limit on tanker (itself influenced by no of avail tankers) etc. Out Of interest , I tried to plan it on the MPS using the constraints imposed on the planners and short of going via some very cold airfields in Newfy land it didn't work.