The Future Aircraft Technology Enhancements (FATE) program is a program to develop new technologies. It is being run by the Air Force Research Laboratory (AFRL) and the Defense Advanced Research Projects Agency (DARPA). The X-39 aircraft designation is reserved for use with FATE by the USAF.

References

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Battle Of The X-Planes
Future Aircraft Technology
Artist's conception of a FATE aircraft

USAF / Joint Service experimental aircraft (X-plane) designations since 1941

Supersonic/special test
"S" (1946–1947)

Experimental
"X" (1948–present)

1–25	X-1 X-2 X-3 X-4 X-5 X-6 X-7 X-8 X-9 X-10 X-11 X-12 X-13 X-14 X-15 X-16 X-17 X-18 X-19 X-20 X-21 X-22 X-23³ X-24 X-24C³ X-25
26–50	X-26 X-27 X-28 X-29 X-30 X-31 X-32 X-33 X-34 X-35 X-36 X-37 X-38 X-39³ X-40 X-41 X-42 X-43 X-44² X-44 MANTA X-44 (UAV) X-45 X-46 X-47 X-47B X-47C X-48 X-49 X-50
51–	X-51 X-52¹ X-53 X-54 X-55 X-56 X-57 X-58¹ X-59 X-60 X-61 X-62 X-63 X-64 X-65 X-66