(CNN/KABC) - A dozen Federal Aviation Administration facilities saw staff shortages Monday because of the ongoing government shutdown, leading to flight delays.

The effects of the government shutdown were felt by many travelers Monday night as air traffic controller staffing issues led to delays at major airports, including Phoenix, Denver and several major Midwest and East Coast hubs.

In California, it got so bad that the control tower at the Hollywood Burbank Airport had to shut down because no controllers were in place to guide takeoffs and landings. Flights had to follow procedures usually only used at airports without towers, which led to delays of more than two-and-a-half hours.

Officials say the staff shortages are a direct result of the shutdown. Controllers are considered essen

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