United Airlines Douglas DC-4 propliners started flying LAX-LAS-GJT-DEN in 1947 and United continued that route until 1977.
یونایتد ایرلاینز داگلاس دی‌سی-۴ propliners started flying LAX-LAS-GJT-DEN in 1947 and United continued that route until 1977.