British Caledonian in the 1970s 31 March 1973 - with the BR airline designator it had inherited from BUA at the time of its formation. This resulted in exclusive use of the BR designator as a prefix for all BCal flight numbers. In 1973, BCal also inaugurated its fourth scheduled domestic trunk route between London Gatwick and Manchester. The new service was contracted to British Island Airways (BIA), BUIA's successor, which operated two daily return trips using its Handley Page Dart Herald turboprops. On 20 March 1974, BCal switched its Gatwick—Paris services to the then brand-new Charles de Gaulle Airport in the northern Paris suburb
Capital Region International Airport led to the building of the current terminal building in 1959. The terminal has had several renovations and additions since then. In April 1967 a new $38,000 observation room opened, where viewers can hear radio communications between pilots and control tower through a loud speaker. In the early 1960s Lansing Community College leased the Francis Aviation Complex at Capital City Airport. The college moved to a new facility near the airport terminal in 1974. In March 1960 Francis Aviation Co. built two circular (roundtable) airport hangars costing $400,000 at the airport, believed to be the world's first. In 1963 Capital