When the flying machine takes off bound for England, the sunrise can be seen to the left of the machine, indicating that they're flying south. If they're flying to England from the USA they should be flying towards the sunrise.
Older-style flying machines, due to less power, had to take off INTO THE WIND. It wouldn't matter what direction they needed to eventually fly, they'd need to fly into the wind to get the lift needed to get the height needed to fly where they needed to go(The launcher would help to make up for lack of runway BUT not lack of lift). You don't really see the sun during their trip, so who is to say they didn't correct their flight path AFTER they gained height for their trip to England?