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passed through tsa checkpoints on thursday alone nbc's blayne alexander is at the nation's busiest airport. >> here in atlanta airport officials expect to see 1.5 million people travel through this holiday weekend. that's the busiest it's been since december of 2019 >> reporter: and at the nation's premier weekend auto race spectators will be back in the stands nbc's tom llamas is in indianapolis >> here at the indy 500 they're expecting more than 130,000 fans on race day, which is sunday it's going to be the largest sporting event anywhere on the planet since the onset of the pandemic organizers feel they can keep the event safe, but they want to make sure fans follow the rules. >> reporter: but with most international travel still off limits the summer's hottest ticket may be the great outdoors the national parks already seeing record-breaking numbers. >> we know that many of the most popular national parks both campgrounds and lodging in and around parks are fully booked or nearly fully booked through labor day weekend. >> reporter: at colorado's cherry creek state park campers and rvs have