Michael Andretti's plan to enter F1 in 2024 -- revealed after his father, racing legend and 1978 F1 champion Mario, tweeted about it at the weekend -- certainly caused a stir in the motor racing world.
There is already an American F1 team, Haas, but the team has shied away from signing an American driver since it joined the grid in 2016.
According to Mario Andretti, Michael would "definitely" enter with an American at the helm of one of his cars.
What do we know of the entry at this stage?
Not a great deal, other than it exists only on paper and in the mind of Michael Andretti.