Did you know that in Avengers: Endgame ?

Did you know that in Avengers: Endgame, Tony Stark might still be alive? In fact, he didn’t die completely. At the end of the movie, when everyone is watching Tony’s hologram, there's a curious detail: the hologram seems to look directly at his daughter, Morgan, in a way that suggests he knew exactly where she was. No hologram would do that unless it was controlled by an artificial intelligence.
There’s a theory suggesting that an AI was inserted into Tony’s helmet shortly after his death, at the moment when he used the Infinity Stone to perform the snap. In the comics, Iron Man becomes an artificial intelligence after his death, and at one point, he’s replaced by a more advanced version of the "Ironheart," which has already been introduced in the Marvel Cinematic Universe, particularly in the movie Black Panther. It would be a way to keep Tony Stark's legacy alive, even after his death.