Miami International Airport will close a terminal early for three days because of a shortage of Transportation Security Administration screeners. The security checkpoints in terminal G will be closed after 1 p.m. on Saturday, Sunday and Monday. Terminal G is one of six terminals in the airport. According to a spokesperson, “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.