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The FAA is closing the air traffic control tower at Midway International Airport, after three workers there tested positive for COVID-19.

The control tower was closed at 5 p.m. Chicago time. Air traffic control operations for Midway will be temporarily moved to another FAA facility. The tower at Midway also is being cleaned and disinfected.

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CBS News reports the airport will now operate one flight in, one flight out. The arriving and departing pilots will announce themselves over a common radio channel, essentially the same procedure for how one would fly into a municipal airport without a tower. Once airborne, pilots will communicate with Chicago TRACON, an FAA radar facility in Elgin. Departures will organize by departure time, and hold short of the runway until the arriving plane clears. Then the first one up will announce and take off.

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Flight operations at Midway Airport are limited Wednesday morning after at least three technicians in the air traffic control tested positive on Tuesday

As of 11:35 a.m., 323 flights have been canceled at the airport after the air control tower had to be shut down after three technicians tested positive for COVID-19.