Do you fly across the Atlantic ocean when travelling from UK to US?

No, the Atlantic ocean is not crossed when travelling from the UK to the US. The UK and the US are both located in the Northern Hemisphere and are separated by the Atlantic ocean. However, the shortest route between the two countries is actually over the Arctic ocean, which is located at the North Pole. This route is known as the "Great Circle Route" and is the path that most airplanes take when travelling between the UK and the US.