As you would expect:
"COVID-19 Travel Industry Monitor tracks a number of indicators that measure the performance of the travel and tourism sector in the United States in the wake of the COVID-19 Pandemic. This monitor has six sections: COVID-19, International Visitation, General Travel, Travel in Trade, Business and Consumer Sentiment, and an Overview of the U.S. economy. "
It is updated weekly. Good data for analysis.
The low was April 2020.