American Airlines flight attendants are urging the world's largest carrier to filter its in-flight Internet service to block access to pornography and other Web sites the workers said were inappropriate.

Attendants and passengers raised "a lot of complaints," and leaders of the Association of Professional Flight Attendants broached the issue with management, without making a formal request for filters, union spokesman David Roscow said Wednesday in an interview. He didn't give specifics about any objections.

In-flight Internet use poses a new challenge for airlines as they balance their cabins' close quarters with the push to offer more amenities to win business and boost revenue from sources other than fares. AMR Corp.'s American began selling access on some cross-country flights on Aug. 20.

The "vast majority" of travelers use good judgment in what they look at, said Tim Smith, a spokesman for Fort Worth, Texas-based American. "Customers viewing inappropriate material on board a flight is not a new scenario for our crews, who have always managed this issue with great success."