Passengers waiting for a flight to Helsinki rest at Lisbon's international Portela Airport on May 10, 2010, as flights were disrupted due to an ash cloud drifting over from a volcano in Iceland that caused major air travel chaos. (AP Photo/Francisco Seco, File)
LONDON (AP) — A fire that closed London's Heathrow Airport has sparked one of the most serious disruptions to air travel in years.
