NEW YORK AMC Theatres, the nation's largest movie theater chain, will reopen in the U.S. on Aug. 20 with retro ticket prices of 15 cents per movie. AMC theaters have reopened in numerous international countries but have remained shuttered in the U.S. since March. During its opening-day promotion, AMC will show catalog films, including Ghostbusters, Black Panther," Back to the Future and Grease." AMC confirmed that Disney's much-delayed New Mutants will debut in theaters Aug. 28, with Christopher Nolan's Tenet to follow Sept. 3. AMC said Thursday is expects about two thirds of its theaters will be open in time for Tenet. Several states, including California and New York, are yet to allow movie theaters to reopen.