The Sunday after Thanksgiving is a notoriously bad day for flying in the United States, and the bad weather in the western part of the country didn't help.
According to the Transportation Security Administration, that Sunday -- not the Wednesday before the holiday -- is the busiest air travel day when measured by airline passengers (about 2.2 million passengers flew the last day of the holiday weekend in 2013). At airports this weekend, it looked like about that many people were at Chicago's Midway Airport alone.
A total of 4,141 flights were delayed, according to FlightAware.
The worst delays were at airports in Denver, Los Angeles and San Francisco, but delayed departures weren't the only travel headaches.
[img src="http://admin.mashable.com/wp-content/uploads/2014/11/Screen-Shot-2014-11-30-at-11.22.33-AM.png" caption="Flight Aware's "misery map" for Sunday, Nov. 30, 2014, afternoon displays where the biggest airport delays in the country are." credit="Flight Aware" alt="Screen Shot 2014-11-30 at 11.22.33 AM"]
At Midway, the line for security stretched 1.2 miles -- all the way to the Chicago Transit Authority station and back.
Security line at #Midway is out the building, to the L, and then loops around. NEVER seen anything like it #missingmyflight @SouthwestAir— Alyssa V. (@vandenburga) November 30, 2014
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The day before Thanksgiving, also a typically heavy travel day, saw more delays in the eastern U.S. -- also because of weather.