Hartsfield-Jackson International Airport general manager John Selden said some passengers waited in security lines for two hours Monday, and more crowds are coming this weekend for the Martin Luther King Jr. holiday period.

“We did have quite a problem on Monday,” Selden told the Atlanta city council transportation committee at a Wednesday morning meeting. “I think some people were at two hours or a little plus two hours to get through the TSA checkpoint” Only 18 of 27 security lanes were open Monday in the Atlanta airport domestic terminal, he said.

Selden said on Monday night, the Transportation Security Administration flew 20 officers in -- who are also not being paid -- to help handle the lines at the Atlanta airport.

Selden said U.S. Customs and Border Protection is not able to use overtime to cover sick call-outs, and waits are more than an hour long for non-U.S. citizens and can be close to an hour for U.S. citizens.