British Airways and replace them with agency staff; it is estimated that the strike cost British Airways £30 million and caused disruption to 100,000 passengers. In October 2006, BA became involved in a civil rights dispute when a Christian employee was forbidden to wear a necklace bearing the cross, a religious symbol. BA's practice of forbidding such symbols has been publicly questioned by British politicians such as the former Home Secretary John Reid and the former Foreign Secretary Jack Straw. Relations have been turbulent between BA and Unite. In 2007, cabin crew threatened strike action over salary changes to be imposed by
British Airways from BOAC, British Airways inherited a mainly UK-built fleet of aircraft when it was formed in 1974. The airline introduced the Boeing 737 and Boeing 757 into the fleet in the 1980s, followed by the Boeing 747-400, Boeing 767 and Boeing 777 in the 1990s. BA was the largest operator of Boeing 747-400s, with 57 in its fleet. Prior to the introduction of the 787, when Boeing built an aircraft for British Airways, it was allocated the customer code "36", which appeared in their aircraft designation as a suffix, such as 737–436. In 1991, British Airways placed its first order