sentences:  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 of Roissy-en-France, thus becoming the first scheduled carrier to operate between London and the new Paris airport.