Air France Flight 4590 crash and possible remedies. Air France's Concorde operation had been a money-losing venture, but it is claimed that the aeroplane had been kept in service as a matter of national pride; British Airways claimed to make a profit on its Concorde operations. According to Jock Lowe, a Concorde pilot, up until the crash of Air France Flight 4590 at Paris, the British Airways Concorde operation made a net average profit of about £30m a year. Commercial service was resumed in November 2001 after a £17m safety improvement service, until the remaining aircraft were retired in 2003. The official investigation was
Concorde altitude winds compared to those at standard cruising altitudes, these dedicated SST tracks had fixed co-ordinates, unlike the standard routes at lower altitudes, whose co-ordinates are replotted twice daily based on forecast weather patterns (jetstreams). Concorde would also be cleared in a block, allowing for a slow climb from 45,000 to during the oceanic crossing as the fuel load gradually decreased. In regular service, Concorde employed an efficient "cruise-climb" flight profile following take-off. The delta-shaped wings required Concorde to adopt a higher angle of attack at low speeds than conventional aircraft, but it allowed the formation of large low pressure