Regnal years of English monarchs Britain), from 1066 to the present day. These are official "de jure" dates, and may or may not coincide with whether a particular king had "de facto" power or not at that time. For example, as the Commonwealth era was suppressed in the official record, the regnal years of Charles II are measured from 30 January 1649 (the day his father Charles I was executed); as a result, when Charles II actually became king, on 29 May 1660, he was already in his 12th regnal year. (For the "de facto" tabulation of English rulers, see any conventional list of English
Monarch Airlines (1946–1950) bought a controlling interest in Challenger in December 1949. Monarch merged with Arizona Airways and Challenger Airlines on June 1, 1950, to form Frontier Airlines. Monarch's President, Hal S. Darr, became President of the new airline. Ray Wilson became V.P. Operations and Maintenance of the new company and Monarch's Treasurer, C.A. Myhre, became Executive Vice President and later President of Frontier. Monarch had five DC3s at the merger: NC64421, NC64422, NC64423, NC64424, and NC66610. They became Frontier Sunliners Arizona, New Mexico, Royal Gorge, Mesa Verde and Utah. Monarch Airlines (1946–1950) Monarch Airlines was an American airline based in Denver, Colorado,