Four airlines cover this connection well, each with a distinct product. British Airways routes through Heathrow in its Club Suite, a proper suite with a closing door, 1-2-1 configuration so every seat has direct aisle access, and White Company bedding that beats most US carriers' business amenities. Virgin Atlantic also connects through Heathrow with Upper Class, similarly suite-style with a door, plus access to the Clubhouse lounge and its social bar if you have a long layover. KLM runs through Amsterdam in World Business Class — not a suite with a door, but a solid lie-flat 1-2-1 seat, and Schiphol is one of the easier airports in Europe to transit, with the added charm of Delft Blue house miniatures served with coffee. Delta offers the most US-centric option, connecting through Atlanta or Minneapolis in the Delta One Suite, which includes a closing door, 1-2-1 seating, and a Tumi amenity kit — a strong choice if you'd rather build the connection domestically before crossing the Atlantic.