Under Robert Six's leadership in the 1940s and 1950s, Continental Airlines expanded its aircraft fleet using profits from World War II. During this war, Six contracted for the airline to provide air transportation to the military, train aircrews, and perform military aircraft modification work at its Denver maintenance facilities. Six served as a lieutenant colonel during the war in the
United States Army Air Corps and later as a reserve officer in charge of his airline's bomber modification center. He also helped improve routes to ferry American aircraft to the European theater, significantly reducing aircraft losses due to weather. Before the war ended, he returned to Continental and resumed his leadership role. In 1951, Six met actress and singer
Ethel Merman; they married in 1953, and settled in
Cherry Hills Village, Colorado. Merman's son, Bob Levitt Jr., recounted that life with Six became oppressive. According to Levitt, he and his mother, sister, and elderly grandparents suffered emotional and physical violence from a regularly explosive Six, who was called "Big Meanie" by his stepchildren. Merman found Denver's society rural and limited compared to
New York. Six and Merman divorced in 1960. From Six's perspective, Merman had failed him by not becoming a public relations prop for Continental. ==Dramatic expansion and move to Los Angeles==