WASHINGTON - (AP) - Transportation Secretary Ray LaHood says thegovernment will lose about $200 million a week in airline tickettaxes and that $2.5 billion in airport construction projects willcome to a halt if the Federal Aviation Administration is forced toshut down.

A shutdown looks increasingly likely because Congress hasn'tbeen able to come to an agreement on legislation to extend theFAA's operating authority by midnight Friday.

If that happens, airlines would no longer collect federal tickettaxes.

Transportation officials said Thursday that about 4,000 FAAworkers - most of them in Washington, Atlantic City, N.J., andOklahoma City - will furloughed.

LaHood says that this is no way to run what he calls "the bestaviation system in the world."