Originally Posted by WorldDC10

No jumpseating on foreign carriers. Their own pilots can't even use the jumpseat in most cases!

Go to the ticket counter to pay the international taxes (that can be expensive). They will then give you a pass to get through security. I would go at least 2 hours prior to get listed on the flight for our friends at the TSA. They should be used to jumpseaters at Heathrow so no big deal.

At most airlines website you can see the number of seats available in the back (necessary since you can't sit up front). It can also be a good idea to post what flight you are thinking about getting and someone can check the loads and the number of non revs standing by - since you will be last to get on.

I have used Delta a few times and always had good luck with them.