Why do airplane wings have a green and red light? What do red and green lights mean? - Quora
Airplane Lights: What Each Light Does (Red/Green, Strobe, Beacon) - Pilot Institute
Where the sky's no limit!: Aircraft Navigation Lights
InterGlobe Education Services Ltd. - Navigation Lights Navigation lights help to determine the aircraft position and direction. They are kept ON at all time, day and night. Red light located on the