Avengers: Endgame

Avengers: Endgame (2019) became the biggest pre-sale title ever on Fandango and Atom Tickets sites, causing them to crash minutes after the sales were announced. It accomplished this feat in only 6 hours. Some theaters across the world had so many sold-out showtimes on the opening weekend that Cinemark, Regal, and AMC theaters chose to add new overnight screenings so that they would be working around the clock to accommodate extra shows.