WASHINGTON (AP) — The Obama administration is warning that automatic spending cuts scheduled to take effect March 1 will result in travel delays at major airports and require traffic-disrupting shutdowns of air traffic control towers at smaller facilities.

Transportation Secretary Ray LaHood says the across the board reductions will require trimming $600 million this year form the Federal Aviation Administration. LaHood says that will mean furloughing air traffic controllers, which in turn will reduce the ability to guide planes in and out of airports.

He says travelers could experience 90 minute delays or more in major cities.