London to Tampa Flightplan

Can someone tell me why some flights from London Gatwick to Tampa go direct over the Atlantic while others go north over Newfoundland and down the coast, and others go inland. :question:

They all direct, it’s just that the shape of the earth closely represents a sphere. … -COLOR=red

Winds. Westbound flights have to fight the jetstream (qv) and its position varies from day to day, sometimes making a more northerly route longer but quicker.