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Boston's Logan International Airport was one of the hardest hit inthe country yesterday afternoon by an outage in the computer systemthat the Federal Aviation Administration uses to alert air trafficcontrollers about the paths of flights nationwide.

The FAA estimates there were possibly hundreds of flight delaysyesterday, but does not expect any flights to be affected today.This marks at least the second time the system has shut down thissummer: In June, a problem with the system also led to some flightdelays and cancellations.

Logan was initially among the most affected during yesterday'ssystem failure, along with airports in New York, Atlanta, andChicago. The FAA did not say how many delays there were at Logan,but said it might be able to provide more details today.

"The airports that were most hard-hit were in the Northeast," FAAspokeswoman Diane Spitaliere said during a conference call. "Thatis one of the things we are looking at: why some airports [had]more delays than others."

Matthew Brelis, a spokesman for the Massachusetts Port Authority,which runs Logan, said the airport asked its concessionairesyesterday to stay open longer, but referred all other questions tothe FAA.