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
Paris suburbs of Paris, opened to commercial traffic in 1974 and became the busiest Parisian airport in 1993. For the year 2017 it was the 5th busiest airport in the world by international traffic and it is the hub for the nation's flag carrier Air France. Beauvais-Tillé Airport, located north of Paris's city centre, is used by charter airlines and low-cost carriers such as Ryanair. Domestically, air travel between Paris and some of France's largest cities such as Lyon, Marseille, or Strasbourg has been in a large measure replaced by high-speed rail due to the opening of several high-speed TGV rail