British Airways, the United Kingdom's flag carrier has been one of Philadelphia International's longest tenured visitors. As part of OneWorld alliance, Speedbird operates two daily flights, with a 747 day flight and a 787 red eye. It isn't unusual to find a 767 or 777 subbing as well.
BRITISH AIRWAYS' B767-300
Although now retired, the Boeing 767-300ER used to fly British Airways 69, the redeye flight to Heathrow up until July of 2015.