Lufthansa is the natural pick given Nuremberg's proximity to Frankfurt and Munich, and its newer Allegris suites on the A350 bring closing doors, more personal storage, and noticeably better privacy than the airline's older business seats — worth requesting specifically when booking. United's Polaris product, reachable via Newark or Chicago connections, offers a proven 1-2-1 lie-flat layout and solid lounge access at its US hubs, a comfortable option for travelers who prefer starting the journey on a domestic carrier. British Airways' Club Suite, with its sliding door and White Company bedding, is arguably the most private hard product in this lineup and routes through London. Turkish Airlines connects via Istanbul and pairs a strong lie-flat seat with DO&CO catering that consistently ranks among the best airline food anywhere. Air France and KLM round out the options through Paris and Amsterdam respectively — both deliver dependable 1-2-1 lie-flat cabins, with Air France leaning into French cuisine and KLM offering the charming touch of its Delft Blue houses for premium passengers.