# 91.209 Aircraft lights.No person may:(a) During the period from sunset to sunrise (or, in Alaska, during the period a prominent unlighted object cannot be seen from a distance of 3 statute miles or the sun is more than 6 degrees below the horizon)—(1) Operate an aircraft unless it has lighted position lights;(2) Park or move an aircraft in, or in dangerous proximity to, a night flight operations area of an airport unless the aircraft—(i) Is clearly illuminated;(ii) Has lighted position lights; or(iii) is in an area that is marked by obstruction lights;(3) Anchor an aircraft unless the aircraft—(i) Has lighted anchor lights; or(ii) Is in an area where anchor lights are not required on vessels; or(b) Operate an aircraft that is equipped with an anticollision light system, unless it has lighted anticollision lights. However, the anticollision lights need not be lighted when the pilot-in-command determines that, because of operating conditions, it would be in the interest of safety to turn the lights off.[Docket 27806, 61 FR 5171, Feb. 9, 1996]