Ingrid Sanden's 1-year-old daughter was stopped in Phoenix before boarding a flight to Washington at Thanksgiving.
''I completely understand the war on terrorism, and I completely understand people wanting to be safe when they fly," Sanden said.
''But," she added, ''focusing the target a little bit is probably a better use of resources."
The government's lists of people who are either barred from flying or who require extra scrutiny before being allowed to board airplanes have grown markedly since the Sept. 11 attacks.
Critics, including the American Civil Liberties Union, say the government does not provide enough information about the people on the lists, so innocent passengers can be caught up in the security sweep if they happen to have the same name as someone on the lists.
This can occur even if the person happens to be a baby. (Children under 2 do not need tickets, but Sanden purchased one for her daughter to ensure that she would have a seat.)
''It was bizarre," Sanden said. ''I was hugely pregnant, and I was like, 'We look really threatening.' "
Sarah Zapolsky and her husband had a similar experience last month while leaving Dulles International Airport outside Washington. An airline ticket agent told them their 11-month-old son was on the government list.
They boarded their flight after ticket agents took a half-hour to fax her son's passport, and fill out paperwork.
''I understand that security is important," Zapolsky said. ''But if they're just guessing, and we have to give up our passport to prove that our 11-month-old is not a terrorist, it's a waste of their time."
Senator Edward M. Kennedy, Representative John Lewis, Democrat of Georgia, and David Nelson, who starred in the sitcom ''The Adventures of Ozzie and Harriet," have been stopped because their names matched those on the lists.
The government has sought to improve its process for checking passengers since the Sept. 11 attacks. The first attempt was scuttled because of fears that the government would have access to too much personal information. A new version, called Secure Flight, is being written.
But for now, airlines still have the duty to check passengers' names against those supplied by the government.
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