The biggest problem, literally, is the size of the ground.
MCG 171m x 146m
Old Trafford 106m x 69.5m
NFL Standard 109m x 48m
Our grounds are almost double the length and more than double the width and therefore everyone is further away from each other which doesn’t create the same atmosphere. Even if you transported the Superbowl half time show directly into the middle of the MCG it would look small and lost because of the sheer size of the ground.
Flyovers by fighter jets however are awesome regardless of the ground size