Frontier Airlines Pilot Wing 2nd Issue 25 Years of Service
Used Between 1955-1963

Frontier Airlines showed years of service on their wing as did United Airlines

Denver, CO 1946-1986

Started as Monarch Air Lines in 1946. Acquired Challenger Airlines in 1949. Merged with Arizona Airways in 1950 and name changed to Frontier Airlines same year. Purchased by Continental Airlines in 1986. Frontier II started in 1994.