Mark the date, July 20, 2019 (also the same day Marvel's announcing Phase 4 at SDCC): Marvel and Disney's 'Avengers: Endgame' is now the number one grossing movie of all time, internationally (it's second domestically behind 'Star Wars: The Force Awakens'). This is without inflation consideration.
On Saturday, the movie crossed $2.7892 billion at the global box office, and will exceed the $500,000 in ticket sales needed to surpass 'Avatar's' $2.7897 billion gross. We should probably expect something from James Cameron pretty soon.
What's likely to ever pass 'Avengers: Endgame'? Probably another Disney movie.