During the government shutdown most employees are furloughed. TSA screeners, however, are supposed to work. They won’t be paid until funding is restored. Screeners have been calling out sick at a higher rate than normal with what’s being referred to as ‘blue flu’ (screeners wear blue uniforms).
At Miami the sick out rate is higher than average, and the airport will close the G concourse checkpoints in the afternoon to compensate. G primarily serves United, Frontier, Sun County, and Bahamasair.