Citing security reasons, British Airways has canceled two more flights from London -- one to Washington Friday and the other to the Saudi capital, Riyadh, on Saturday.
The afternoon London-to-Washington flight, number 223, was scrapped amid reports of a threat of a terrorist attack on Washington.
Friday's cancellation was the third time the flight has been the subject of security concerns. Passengers on Flight 223 Wednesday were kept on board the plane for several hours of questioning after it arrived at Dulles International Airport near Washington. The Thursday flight was canceled.
British Airways says Saturday's Flight 263 to Riyadh was canceled on advice from the British government. A London-to-Riyadh flight was canceled for the same reason on Wednesday.
On Thursday, for the second time in two days, an AeroMexico flight from Mexico City to Los Angeles was canceled. U.S. officials had warned that the flight could be the target of an attack.
U.S. authorities have also said recent intelligence has raised concerns that the al-Qaida terrorist network may be planning to use a passenger or cargo airliner for a terrorist attack.
Meanwhile, French officials say Mirage fighter jets have been put on alert across France because of security threats and concerns over air safety.
Information for this report is provided by AFP.