Throughput at TSA checkpoints on Aug. 31 dipped to the lowest level since May 11.  

For the day, 1.35 million people passed through airport security checks, compared to 2.04 million in 2019. It was the first time since May 11 that the throughput number was below 1.4 million. 

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The dip comes as the delta variant of Covid-19 has put a dent in the domestic travel rebound. It also coincides with the time of year when the summer travel season normally tails off as children return to school, though the upcoming Labor Day weekend usually drives a final surge of summer travel. 

Still, on the Tuesday before Memorial Day, which falls before most schools let out for summer, 1.47 million people passed through TSA checkpoints — significantly more than the 1.35 million travelers on Aug. 31.

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