brickhistory
That would be because USAF RC-135s are US registered, whereas Airseeker will have to be UK registered, unless there is a lot of jiggery pokery, and they somehow register it as a US a/c, service it as a US a/c but fly it with UK crews. Can't see it myself, and being able to trace all the airworthiness aspects of a 40+ year old a/c that has sat in a desert for years is nigh on impossible. This is something the MAA or MOD has never done before, and will surely be interesting to watch unfold.