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To put this issue to rest: I just learned that the X-53A designation was actually applied to the F/A-18A (s/n NASA 853) modified for AAW research.Andreas Parsch said:However, no information about the specific air vehicle, to which X-53A applies, came forward. There was an AAW (Active Aeroelastic Wing) program going on at the AFRL from 2002 to mid-2005, using a modified F-18. There were follow-on programs (e.g. here and here), and my guess is that X-53A has been reserved for a possible full scale flying AAW testbed.