Widebody

A twin-aisle aircraft — 777, 787, A350, A380, A330 — as against single-aisle narrowbodies. The premium-cabin significance: flagship business products live almost exclusively on widebodies, while narrowbodies increasingly fly long routes (transatlantic A321s and 737 MAXes) with lighter cabins. The aircraft type on your itinerary is therefore a product decision, not trivia — the same fare class on the same route can mean a suite or a recliner depending on the metal.