Hannah Pillinger, 24, seemed less concerned by the announcement. "Eight hours without an iPod, that's the most inconvenient thing," she said, waiting at the Manchester airport.

Most European carriers canceled flights to Heathrow because of the massive delays created after authorities enforced strict new regulations banning most hand baggage.

Tony Douglas, Heathrow's managing director, said the airport hoped to resume normal operations Friday, but passengers would still face delays and a ban on cabin baggage "for the foreseeable future."

"At this point in time it is unclear how long these restrictions will remain in place," he said.

Heathrow's block on incoming traffic applied to flights of three hours or less, affecting most of the incoming traffic from Europe, an airport spokesman said on condition of anonymity in line with airport policy.

Officials at Frankfurt's airport, Europe's second-busiest, Schiphol in Amsterdam and Charles De Gaulle in Paris said Heathrow-bound planes could instead land at their airports if they needed to.

London's Heathrow airport was the departure point for a devastating terrorist attack on a Pan Am airplane on Dec. 21, 1988. The blast over Lockerbie, Scotland, killed all 259 people aboard Pan Am Flight 103 and 11 people on the ground.

The explosive was hidden in a portable radio secreted in checked baggage.