The pilot called air traffic control to report a man wearing a jetpack flying near the plane.
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Tower tapes released detail the pilot's exchange.
Pilot: "Tower, American 1997, we just passed a guy in a jetpack."
Tower: "American 1997, OK, thank you. Were they off to your left or right side?"
Pilot: "Off the left side, maybe 300 yards or so, about our altitude."
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The jet was flying at an altitude of 3,000 feet at the time of the encounter.
The tower then warned other approaching flights to be on the lookout for a man in the jetpack.
The incident is under investigation.
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