i recently flew to torronto with dirt-cheap airline air transat they had an option to pay £8 to book your seat, a bit of googling later an i'd managed to get a huge amount of legroom (more than buisness class) and a plenty of elbow room, it was one of the seats at the back of an airbus where it narrows slightly and loses a seat per row. £230 return, best long haul flight ever..