Well, it was only a powered glider, but it's still impressive:
....his HK 36 Super Dimona carried a 200-pound hydrogen fuel cell that ran an electric motor to turn its propeller. The fuel cell couldn’t quite put out the energy required for takeoff—45 kilowatts—and got help from a lithium ion battery to lift off the runway in Ocaña, Spain. At 3,300 feet Barberán disconnected the battery, and for the next 20 minutes the Super Dimona flew straight and level at about 60 mph on just the fuel cell. It was the first time a piloted airplane had flown powered by a fuel cell alone.
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