On November 13, 1993, at 1440 hours Pacific standard time, a Cessna 150, N9231U, lost control and veered off the left side of runway 18 at the Las Vegas-Henderson Sky Harbor Airport (L15), Las Vegas, Nevada. The noncertificated student pilot was conducting his first supervised solo visual flight rules instructional flight. The airplane, operated by ProFlight, Las Vegas, was substantially damaged. The noncertificated student pilot was not injured. Visual meteorological conditions prevailed at the time. The flight originated at L15 at 1400 hours. The student pilot was completing the third landing of his first supervised solo flight. The airplane departed the left side of runway 18 about 800 feet from the threshold. The operator submitted the required Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1/2, on December 12, 1994. The student pilot stated that while landing on runway 18 an airplane was in position to takeoff from runway 36. This situation, together with two other helicopters flying low at the west side of the airport, frightened him. The student pilot said that he "...flared too soon and overcorrected." The airplane settled in the desert. The operator indicated in the accident report that the airplane did not experience any mechanical malfunctions or failures.