Kingdom quickly extradited Ray to the United States where he was to have his trial in Tennessee, where Dr. King was assassinated. 6 November 1968: Terminal 1 opened, completing the cluster of buildings at the centre of the airport site. By this time Heathrow was handling 14 million passengers annually. Then or later, Building 1 (Europa) and Building 2 (Britannic) were jointly renamed Terminal 2. 17 April 1969: Queen Elizabeth II formally inaugurated Terminal 1. The original terminals being in the centre of the site became a constraint on expansion. Built for easy access to all runways, it was assumed that passengers using the terminals would not need extensive car parking, as air travel was beyond all but the wealthy, who would be chauffeur-driven with the chauffeur leaving with the car once his passengers had departed, and coming back with the car to collect his returning passenger. Late 1960s: The cargo terminal was built to the south of the southern runway, connected to Terminals 1, 2 and 3 by the Heathrow Cargo Tunnel. 1970s 1970: Terminal 3 was expanded with the addition of an arrivals building in 1970. Other new facilities included the UK's first moving walkways. Heathrow's two main east-west runways, 10L/28R and 10R/28L (later redesignated 09L/27R and 09R/27L) were also extended to their current lengths to accommodate new large jets such as the Boeing 747. The other runways were closed to facilitate terminal expansion, except for Runway 23, which remained available for crosswind landings until 2002. 1973: The truth about the secret Air Ministry plan came out, in Harold Balfour's autobiography (Wings over Westminster, publ. Hutchinson, London, 1973). 1974: The check-in facilities at the West London Air Terminal close. 1974: Heathrow was briefly occupied by the Army, ostensibly as a training run in case of possible IRA terrorism. However, in a documentary, The Plot Against Harold Wilson in 2006, Baroness Falkender asserted that the government was not informed in advance. The occupation of Heathrow was privately seen at Number 10 as a warning to Wilson by the Army, or even a dress rehearsal for a coup d'etat. 19 July 1975: London Underground's Piccadilly line extension from Hounslow West opened as far as Hatton Cross. 1977: The Piccadilly line opened from Hatton Cross to Heathrow Central, putting the airport within just under an hour's journey of Central London. 1980s Early 1980s: Annual passenger numbers had increased to 30 million,