Four airlines cover this corridor well, and each has a distinct product worth understanding before you book. British Airways' Club Suite gives you a closing door and 1-2-1 configuration through Heathrow, with White Company bedding that's a noticeable step up from BA's older cabins. Virgin Atlantic's Upper Class, also via Heathrow, pairs a similar suite-with-door layout with the Clubhouse lounge experience and an onboard social bar that's genuinely fun on the transatlantic leg. KLM's World Business Class routes through Amsterdam and skips the closing door in favor of a straightforward lie-flat 1-2-1 seat, plus their well-known Delft Blue houses gifted to business class passengers — a nice touch, and Amsterdam is an efficient hub with minimal connection stress. Delta One Suites, connecting through Atlanta or Minneapolis, offer a privacy door and Tumi amenity kits, and since Delta is a domestic carrier this option often appeals to travelers who prefer to fly one airline start to finish rather than switching alliances mid-journey.