March 1961, BEA began commercial Vanguard services following a delay to the aircraft's entry into service, as a result of major defects discovered in its Rolls-Royce Tyne engine's compressor during testing in early 1960. Following their delayed entry into service, BEA's Vanguards began flying to international destinations such as Malta and Barcelona and by 1962, took over approximately half of the flights previously operated by Viscounts on the airline's UK domestic trunk routes, where they operated in a 132-seat, single-class configuration. The Vanguards' introduction on BEA's Heathrow–Scotland trunk routes increased traffic by more than 20%. On 1 April 1961, BEA moved some flights to Paris (Le Bourget) and other European destinations from Heathrow to Gatwick in accordance with the wishes of the British government to develop the latter airport. In 1962, BEA sold its 25% minority holding in Jersey Airlines. This was followed by the BUA group's takeover of Jersey Airlines in May of that year. On 19 May 1962, Pionair G-ALTT operated the type's final service on BEA's Scottish internal network between Islay, Campbeltown and Glasgow (Renfrew). In its 1962-63 annual report, BEA estimated that introduction of both the Comet 4B and Vanguard had cost it more than £6 million over a two-year period. The airline considered this "a heavy financial burden" in support of British aircraft manufacturers, which adversely impacted its ability to compete with overseas rivals whose choice of aircraft was not influenced by political considerations. In November 1963, BEA's independent rival British Eagle became the first independent airline to compete with it on a main UK domestic trunk route, when the independent launched daily scheduled services between London Heathrow and Glasgow with 103-seater, two-class Bristol Britannias. This was followed by daily two-class Britannia services from Heathrow to Edinburgh and Belfast the next day. This was also the first time a scheduled airline had offered a separate first class cabin on a domestic route in the UK. As British Eagle was restricted to a single daily round-trip on each route, it sought to differentiate itself from BEA. While BEA served these routes with 132-seat Vanguards in an all-tourist configuration with minimal onboard catering, British Eagle provided full catering on all flights. British Eagle furthermore differentiated itself from its state-owned competitor by introducing assigned seating and "trickle loading". The former was a first for a UK scheduled domestic carrier while the airline claimed to have started the latter