Our answer
All three give you a flat bed with direct aisle access on their main long-haul planes, so you can’t go too badly wrong. The differences:
Delta One
- Delta One Suites with a sliding door on many long-haul aircraft.
- Delta One lounges in some hubs, plus Delta Sky Clubs.
- Known for consistent service and reliability.
- Best for Delta SkyMiles members and travelers from hubs like Atlanta, Detroit, Minneapolis and New York.
United Polaris
- Polaris seats on all long-haul widebodies, with newer, bigger “Polaris Studio” seats on some aircraft.
- Polaris lounges, which many travelers rate very highly.
- Huge network from Newark, Chicago, Washington, Houston, Denver and San Francisco.
American Flagship Business
- Newer Flagship Suites with doors on some aircraft, older seats on others.
- Flagship lounges at main hubs.
- Strong to London, Europe and South America, with partner British Airways.
Our honest view: pick the airline that flies the best route for you, then check the exact aircraft. A Delta One Suite on a nonstop beats a great seat with an extra connection.
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Answered by the Global Business Flights team, booking business and first class since 2017. Last reviewed November 2026.
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