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CHICAGO — The long lines were back at Chicago’s Midway International Airport Wednesday morning.

The TSA estimated a wait time of up to two-hours at Midway Airport’s main security checkpoint.

It is unknown what caused the long lines this morning, but it is reported that the wait times are improving.

WGN viewer Mark Ratay sent us these pictures showing the TSA line backed up to the CTA trains earlier Wednesday:

There are no reported issues at Chicago’s O’Hare Airport.

This is a developing story. Check back for details.