LOS ANGELES (AP) - A new Internet site allows people bugged by aircraft noise to pin down the altitude and identity of airplanes that roar over their neighborhoods.

The Web site, called LAX Internet Flight Tracks, debuted this month and has been logging about 660 users a day. It allows the public to find the altitude, operating airline and tail number of planes in the flight path of Los Angeles International Airport.

The site was designed to help the 90,000 people living in the airport's flight path to more easily monitor aircraft noise. Planes flying too low or out of bounds can be reported to the airline or the Federal Aviation Administration.

``If someone gets woken up at 3 a.m. because of an eastern departure, they can go online, click and see who it was, and call the airline and ask what they're doing,'' said Roger Johnson of the city agency that runs LAX.

``A big 747-400 went right over the homes of people in Playa del Rey, and we were able to look up and find out who the offending aircraft was,'' said Danny Schneider of Westchester.

The$35,000 system tracks a plane by listening to its transponder communications with the local radar system. The Web site shows flights arriving, departing and moving through the area, but with a 10-minute delay for security reasons.

Planes are superimposed on a map of the Los Angeles area. Users can zoom in on neighborhoods. Clicking on an airplane icon provides the aircraft type, altitude and other data.

Users can wait an hour and use the site's replay function to find out the plane's tail number, the airline operating it, the airport where the flight originated and its destination.

In the Bay Area, a similar system provides the altitude and airspeed for arriving and departing aircraft, but not the airline or tail number.

Residents can call San Francisco International Airport for that information, airport spokesman Ron Wilson said.

The site receives about 300 hits a day, he added.

``It has debunked the myth that the plane is really 500 feet over someone's house,'' Wilson said. ``It makes it easier for us to live with each other.''