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In my most recent flight (Mar 2011) from London to LA we flew north over Scotland.
It depends on where in the US you are travelling to. There are some direct flights from Glasgow to the US but you may have to travel to London to get a wider choice.
No there are no direct flights from Louisville to Nassau. Delta, US Airways, United, and American all offer flights from Louisville to Nassau.
There are no direct flights between Glasgow and Los Angeles. You would have to change, either in London or a US hub.
I do not know where you are but any international flights require passports.
There are no direct flights between Edinburgh and San Diego. You will have to change planes and airlines either in London or one of the US hubs.
The website ba.com is for British Airways. The site allows you to connect to both the UK and US sides of the company. After picking one, you are directed to another site that allows you to book flights with their company. They offer cheap flights to and from London.
The FAA prohibits smoking on board for any flights in the US. Smoking is also prohibited on international flights. Few (if any) countries still allow smoking on domestic flights. Whether or not the person is a crew member has no relevance.
There are no commercial flights to Antarctica from anywhere in the world.
US Airways uses the A330 series for their international flights.
Right. Even on connecting flights, you need a visa when entering US soil.
The best place to find US Airways flights would be on the official US Airways site. Or, one could check out Expedia or Travelocity as they list all flights available for booking.