Continental Air Services, Inc
Continental Air Services, Inc (better known in abbreviations as CASI) was a subsidiary airline of Continental Airlines set up to provide operations and airlift support in Southeast Asia during the Vietnam War. CASI was formed as the South-East Asia Division of Continental in April 1965 with operations starting in September 1965 using approximately 22, mainly STOL, aircraft.
Source: Wikipedia — Continental Air Services, Inc (CC BY-SA 4.0)