On the airline side, Delta's Delta One Suite via Atlanta gives you a door that closes, a 1-2-1 layout so every seat has aisle access, and a Tumi amenity kit — a strong option if you want a single-carrier itinerary with minimal connection risk since Delta controls both legs. British Airways' Club Suite, also with a closing door and White Company bedding, routes through London and pairs well if you want a night or stopover in the UK. Lufthansa's newer Allegris Business cabin, flying on the A350, is worth seeking out specifically — it's a noticeably more private suite than Lufthansa's older business product, and connecting through Frankfurt keeps the transfer efficient. Iberia via Madrid brings a Spanish culinary bent to the onboard service and can be a smart pick if fares are running lower on that routing, while Air France through Paris offers the most traditionally French service style, with access to the La Première lounge for elite or premium ticket holders during the connection. All five airlines fly 1-2-1 lie-flat or suite configurations, so seat comfort isn't really the differentiator here — it comes down to connection city, schedule, and price.