ATLANTA — Air travelers endured waits of more than an hour to get through domestic checkpoints at the world’s busiest airport in Atlanta on Monday, the first business day after security screeners missed paychecks for the first time due to partial government shutdown. No-shows among screeners across the nation soared Sunday and again Monday, when the Transportation Security Administration reported a national absence rate of 7.6 percent, compared with 3.2 percent on the comparable Monday a year ago. Hartsfield-Jackson Atlanta International Airport reported the long lines on its website Monday morning, showing the hour-plus waits at all three checkpoints in the domestic terminal. TSA is working with the Atlanta airport and airlines “to maximize all available operational resources at the airport,” TSA spokesman Jim Gregory said. The agency is working with airports and airlines nationwide to consolidate operations and get the most out of resources, Gregory added.