Premium transcontinental

The US coast-to-coast routes — New York to Los Angeles and San Francisco chiefly — where carriers deploy flagship cabins domestically: lie-flat seats, and on select aircraft the same suites that fly oceans. It is the one domestic market where international-grade business class exists, priced accordingly, and it doubles as the feed into international itineraries: positioning to a gateway in a flat bed rather than a recliner. Availability concentrates on a handful of flights, so it books like a long-haul.