It seems Pepper Potts (Gwyneth Paltrow) lived, Tony Stark (Robert Downey Jr.) and Captain America (Chris Evans) make up and another huge battle with Thanos (Josh Brolin) will take place — not too surprising, but this is the first good look at Thanos in an Endgame trailer.

Not long after advance tickets went on sale, #AvengersEndgametickets was the No. 1 trend on Twitter, as fans were having trouble with clogged theater websites.

When Heat Vision attempted to purchase tickets for opening day (April 26), the AMC site gave a 503 error code. Around 8 a.m., the website was down entirely. By 1 p.m., the site was running again. Around that time, Fandango announced that Endgame "crushed" the first day U.S. sales record set by 2015's Star Wars: The Force Awakens within the first six hours of presales. Fans on Twitter shared their own issues with other sites, including wait times of more than 30 minutes in a queue.

On Wednesday, AMC confirmed that the "unprecedented" number of fans trying to get Endgame tickets indeed crashed the company's site and mobile app with traffic volume approximately 10 times higher than normal, and double AMC’s previous record, a spokesman told The Hollywood Reporter. As with Fandango, Endgame was AMC’s new U.S. first-day presale record holder, beating Force Awakens by approximately 50%.

In fact, Endgame presales were three times more than Avengers: Infinity War its first day of ticketing, and AMC did more on for the first day for Endgame ticketing than the initial day of advance tickets for Infinity War, Captain Marvel, Black Panther and Last Jedi combined, according to the AMC spokesman.

Also on Wednesday, Fandango announced that Endgame not only produced the best first day of presales, but was the site's single best-selling day ever – topping any moviegoing day during the Christmas holidays over the last 19 years. That was also the case for the site's international brands with Endgame breaking records in 12 countries, according to a spokesman.

UPDATES:

April 3, 7:20 a.m.: Updated with new information from Fandango.

April 3, 6:45 a.m.: Updated with new information from AMC.

1 p.m.: Updated with new information from Fandango about Star Wars broken record.