It has taken Avengers: Endgame 13 weeks, and in that time it has broken almost every box office record, but this weekend it gets the biggest prize of all and beats Avatar to become the highest grossing movie of all time.

Avatar released in 2009 has held the honor for the last 10 years with a total gross of $2.789 Billion from its initial release and all subsequent releases but Avengers: Endgame hits a gross of $2.790 Billion this Saturday.

There was a time when it was thought the gross would never be beaten and despite the former top grossing movie Titanic getting a re-release and pushing its gross over $2 Billion and Star Wars: The Force Awakens having a good go back in 2015 neither were good enough.

There is every possibility that the total global gross will continue to grow and although it seems unlikely now who knows it could be the first film to get to $3 Billion.

Although the gross of the film has beaten Avatar the ticket sales, or adjusted for inflation as its often known as, is still a way from Avatar which would have grossed $3.273 Billion were it released today, although Gone With The Wind from 1939 is still on top of that list.

It is only a matter of time before we get the first $3 Billion film, and hence beating Avenger: Endgame but for the time being Disney and Marvel can enjoy this mighty task.

He was the first writer/director to get a film past the $1 Billion world gross mark with a single film and this week James Cameron becomes the first writer/director to pass the $2 Billion dollar mark in world box office takings, with a single film.

James Cameron must be having a good year, his return to film making after a 12 year break has beaten his own box office landmark film Titanic, all in the same week that 12 years after he won his first Oscar, he's nominated for another, although he has tougher competition this time (his ex-wife!).

In 1998 he set the box office alight and Titanic took $1.8 Billion in box office grosses, passing a milestone figure that took another 5 years before a film would pass it again, and this week another milestone is set as Avatars gross reaches $2 Billion, but unlike Titanic in 1998 Avatar still has some mileage left in it.

With the rate of tickets being sold the possibility of Avatar reaching $2.5 Billion is not out of the question, $3 Billion could be a stretch thought.

To look at this correctly though we need to take into consideration inflation, cinema tickets cost nearly half the price in 1998 as they do in 2010, which means that per head watching Titanic on the big screen it's probably still ahead of Avatar, but the gap is certainly closing fast.

Titanic of course isn't by a long shot the biggest film by the number of tickets sold, that honor goes to Gone With the Wind, which may never be beaten. Another thing to remember, boosting Avatar's box office takings is the appalling extra charge for the glasses if you choose to see the film in 3D. So until Cameron's next film Avatar will probably sit pretty as the only film to gross anywhere near $3 Billion pound?