More than 1.5 million passengers were screened at US airports last Sunday.
Such a high rate was recorded for the first time since March 2020, according to the US Transportation Security Administration (TSA).
The aviation industry has been particularly hard hit by the COVID-19 pandemic, with air travel declining 60 percent in 2020.
Currently, entry into the United States is restricted for non-American citizens who have traveled to Brazil, South Africa, and China.
Many European countries have restrictions on the entry of Americans.
On Sunday, 1.54 million people passed security checks, the highest since March 13, 2020, when the United States declared a state of emergency over the coronavirus pandemic.
In addition, for the 11th day in a row, the number of those who passed the screening exceeded 1 million.