With the rising popularity of relatively affordable streaming services, the cost of attending a movie — from tickets to refreshments — has priced out some Americans.

AMC Theatres is issuing a warning to moviegoers that their movies may not actually start at their listed showtimes.

AMC, the movie theater chain, reversed course six years after it rejected a proposal to show more ads before movies, fearing a negative reaction from customers. Philip Cheung for The New York Times ...