(CNN/CBS13) — The number of travelers passing through airport security checkpoints in the United States reached its highest level since mid-March on Wednesday despite urging from federal health officials for Americans to spend Thanksgiving at home.

In a pandemic-era record, more than 1 million people passed through security at America’s airports on the day before Thanksgiving. That number is just 40% of last year’s passenger volume on the same day when 2,602,631 people were screened.

READ MORE: While New California Stimulus Could Go Long Way For Some, Economist Says It May Bring No Benefits

The US Centers for Disease Control and Prevention last week urged Americans not to travel for Thanksgiving, but since that warning was issued nearly 6 million travelers have passed through airport security.

The TSA receives passenger information from the airlines as part of its screening responsibilities, and the data does not show widespread cancellations in recent days, TSA spokesman Andy Post said.

READ ALSO: Local Schools Won’t Require Quarantine After Holiday Travel

From September to October, the number of scheduled available seats departing US airports was down nearly 50% compared to the same timeframe last year. Due to increased demand, that number is only down 39% for the Thanksgiving holiday period, according to Airlines for America, a trade association that represents major North American airlines.

READ MORE: Suspect Killed In San Andreas Hostage Situation Identified, Said To Have Lengthy Criminal History

Industry groups expect the Sunday after the holiday to be even busier than Wednesday.

The number of travelers passing through airport security amid the coronavirus surge is concerning, but many Americans are heeding the warnings from officials and health experts.

Sixty-one percent of Americans said they changed their Thanksgiving plans, according to a poll released on Tuesday by Axios-Ipsos. More surprising is that nearly one in 10 Americans that were polled say they do not plan to celebrate the holiday at all.

The country added 181,490 new Covid-19 cases and had 2,297 reported deaths on Wednesday, according to Johns Hopkins University.

The US has posted over 100,000 new coronavirus cases for the 23rd consecutive day.

MORE NEWS: 44 Attorneys General Urge Facebook To Stop Plans For An Instagram For Kids

™ & © 2020 Cable News Network, Inc., a WarnerMedia Company. All rights reserved.