(CNN) Miami International Airport will close a concourse early for three days because of a shortage of Transportation Security Administration screeners, airport spokesman Greg Chin said.

Concourse G will be closed after 1 p.m. on Saturday, Sunday and Monday, he said. The airport has three terminals, which are divided into six concourses.

"Due to an increased number of TSA screeners not reporting to work, we have decided to take this precautionary step and relocate about 12 flights to adjoining concourses in the afternoons," he said.

Twenty non-federal employees could be out of work due to the temporary closure of four dining locations and one gift shop in and around Concourse G, Chin said.

Chin said Thursday that federal screeners were calling in sick at double the normal rate for Miami, and TSA managers aren't confident they will have enough workers to operate all checkpoints throughout the airport at normal hours.

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