Flight Groundings Lead Allies to Query Washington

British Airways canceled another flight to the United States on Friday as the Bush administration faced questions from American allies about the reliability of the intelligence information that has led to the recent rash of flight cancellations.

The British airline grounded a flight from London to Washington — the third cancellation over all in 24 hours — and canceled a flight scheduled for Saturday from London to Riyadh, Saudi Arabia.

Seven international flights have now been canceled since last Saturday after the Bush administration began an aggressive approach to defending American airspace when the nation was put on orange or "high" alert on Dec. 21. Administration officials said no arrests had been made in connection with any of the more than a dozen international flights subjected to rigorous scrutiny. And officials have acknowledged that even now, they are uncertain whether they have succeeded in foiling a terrorist plot.

"I don't think we know yet, and we may never know," a senior administration official said.

The latest concern over the tighter security — perhaps unparalleled in commercial aviation history — was raised by Mexico on Friday. A spokesman for President Vicente Fox questioned decisions by the United States on New Year's Eve and New Year's Day to cancel Aeromexico's Flight 490 from Mexico City to Los Angeles. The spokesman, Agustin Gutiérrez Canet, said that armed Mexican agents had been scheduled to fly aboard the flights and that the authorities made special efforts to interrogate passengers closely and inspect luggage.

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