Sunday expected to be busiest travel day of holiday weekend

Sunday is expected to be the busiest travel day of the holiday season.

Millions of people are hitting the road, rails and air. 

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The Chicago Department of Aviation was expecting to see 1.2 million passengers at both airports for the holiday as a whole. 

The busiest time to be on the road Sunday is between 1 p.m. and 7 p.m.