It's the summer travel season and there's optimism and pessimism.

The aviation industry is counting on a return to passenger capacity this summer after the Memorial Day Weekend numbers surpassed pre-pandemic levels.

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That part is optimistic.

There is pessimism over the problems that the U.S. carriers encountered on the first big weekend, due to staffing shortages, pilot shortages and weather.

There were 5,092 delays into and out of the U.S. airports on Sunday, May 29, according to the flight tracking service flightaware.com. More than 1,300 flights were canceled and more than 12,000 were delayed over three days.

Travel experts say it could play out over the summer. They are not just anticipating it, they are counting on it.

The daily passenger volumes at the checkpoint show that people are traveling again. The administrator of the transportation security administration said in a statement earlier this month that the airport has 47,500 highly-trained security professionals and new technologies that enhance security and reduce physical contact.

Pekoske pleaded with passengers to pack more patience.

The chief executive of Priceline told the Los Angeles Times that it was going to be very expensive.

Passengers are still traveling. The numbers for the Thursday through Sunday time frame of Memorial Day Weekend stacked up with the same dates from the previous year.

The number of passengers flown this year is higher than the number flown in the previous three years.

This year, 2,384,721 passengers have been flown, compared to 2,570,613 in 2019.

The number of passengers flown this year is more than the number flown in the previous three years.

The number of passengers flown this year is 2,096,466 compared to 2,555,578 in 2019.

For the first four days of the long weekend, 8,855,198 fliers went through the security checkpoint at the airports. The capacity that flew in the year was less than 90 percent.

On 18 days, passenger traffic has surpassed 2 million fliers.