It happens hundreds of times a day. Aircraft flying from North America To Europe. In all cases they must travel across the North Atlantic Ocean.

An agreement between Canada, USA, Iceland, Ireland, and the UK have resulted in standard routes that aircraft must follow to get from point A to point B.

These routes are called North Atlantic Routes (or North Atlantic Tracks) and are named using a letter designator: A through G for westbound tracks and U to Z for eastbound tracks.

These are not fixed routes, but change every day as …