The Brief Holiday travel is expected to bring major traffic and airport crowds across the Chicago area this Labor Day weekend. The last summer getaway means Chicago-area roads are going to be congested. Construction will continue on those roads, so the closures are still going to be in place. American Airlines says today is the launch of the busiest Labor Day weekend ever at O’Hare. What they're saying:Drivers say they are aware of the peak travel times and will plan ahead, whether heading out or heading home.