CinemaCon attendee Luis Saint Amant, of Argentina, takes a selfie in front of an advertisement for the upcoming film "Avengers: Endgame," on the first day of CinemaCon 2019, the official convention of the National Association of Theatre Owners (NATO) at Caesars Palace, Monday, April 1, 2019, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)