Over 1.67 million passengers are expected to travel through O’hare and Midway through Tuesday. Airlines are predicting an 8.6 percent increase in travel compared to last year. O’Hare is expected to see a 10 percent increase over last year and a 3.1 percent increase at Midway. Today is expected to be the busiest day at both airports.

Airlines are struggling to keep flights on time heading into the Memorial Day holiday weekend, but at least cancellations have been relatively modest so far. The big test comes Friday, which is expected to be the busiest day of the weekend for air travel. The Transportation Security Administration predicts nearly 3 million people will pass through airport checkpoints Friday, which could threaten the record of 2.9 million, set on the Sunday after Thanksgiving last year. Even more people will be on the roads. AAA says about 38 million of the 44 million people who are expected to travel at least 50 miles from home this weekend will go by vehicle.