FAA closed the tower at 5 p.m. CDT (2200 GMT) and it was going
to be cleaned again. It was not clear when it would reopen.
Arriving and departing pilots will announce their presence and
intentions through airport frequencies.
The agency issued a temporary ground stop after it closed the
tower, but it was not expected to last for a significant period.
Southwest Airlines Co accounts for the vast majority of traffic
at Chicago's Midway.
The FAA said in a statement that "the air traffic system is a
resilient system with multiple backups in place. This shift is a
regular execution of a longstanding contingency plan to ensure
The FAA said previously the Midway Control Tower had been
cleaned in accordance with guidance from the U.S. Centers for
Disease Control and Prevention.
The diagnoses are in addition to three separate cases that the
FAA disclosed to its employees in a letter on Monday, the first
positive coronavirus cases among the agency's employees.
One of the employees works at FAA headquarters in Washington,
another at an aviation safety district office in Chicago and the
third in finance and management in the agency's Eastern Region
in a full-time telework capacity, the FAA said.
(Reporting by Tracy Rucinski and David Shepardson; Editing by
Paul Simao and Peter Cooney)
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