The US Federal Aviation Administration is investigating four reports of pilots being temporarily blinded by lasers while flying aircraft in the Los Angeles area. The last reported incident occurred when the pilot of a United Airlines Boeing 737 felt a powerful green light flash in his eyes. The light allegedly came from a subdivision near Ontario International Airport. A UPS jet also approaching the Ontario, Calif., airport was swept by a similar beam, blinding the pilot. The co-pilot landed the plane. Other incidents included the temporary blinding of the captain flying a Skywest plane as he approached Los Angeles.