Easy boarding and pleasant crew. However the moment we boarded the unit that gives air circulation failed. The pilot educated us and asked for servicing technicians to check it out. Under is an index of other destinations to United states from Heathrow with either direct flights or one end connections. https://www.diigo.com/item/note/b7ses/sao4?k=43525516991a572dc4bd535d74a8ef4c