United States head to head

United Polaris vs Delta One vs American Flagship Business

3 airlines · 23 business cabins scored · best 9.1/10

These three brands are the reason business class is confusing. Each name covers several physically different seats, and which one you get depends on the airframe scheduled that day — not on the fare, the route, or the marketing page. CabinScore scores each of those seats separately, so below is what each brand actually rates, where the good version flies, and where the brand name is hiding something much older.

Side by Side

Business-class metrics compared across United Airlines, Delta Air Lines, American Airlines
Metric	United Airlines	Delta Air Lines	American Airlines
Best cabin measured	United Polaris Business (Elevated Interior)	Delta One Suites	American Airlines Flagship Suite
Best CabinScore	9.1/10	9.0/10	8.7/10
Typical CabinScore	8.4/10	8.5/10	8.0/10
Worst cabin measured	United First (5.1)	Delta One (5.5)	American Airlines First (4.0)
Cabins measured	10	7	6
Aircraft types measured	8	7	5
Routes tracked	47	41	23
Seat width (best)	52 cm	57 cm	55.9 cm
Bed length (best)	198 cm	203 cm	—
Direct aisle access	Best cabin only	Best cabin only	Best cabin only
Any measured cabin not lie-flat	None so far — coverage incomplete	None so far — coverage incomplete	Yes — 1 cabin
Privacy (best cabin)	10.0/10	10.0/10	10.0/10

“Typical CabinScore” weights each cabin by how often the flight data shows it flying the routes CabinScore tracks. It is the number that answers “what will I probably get” rather than “what is the best they have”. Every row describes the cabins CabinScore has measured on those routes — not each airline's entire fleet, which it does not claim to cover.

The Verdict

On hardware alone, United Airlines wins: its United Polaris Business (Elevated Interior) scores 9.1/10, the best in this comparison.

That is not the same as the best bet. Weighted by what we actually observe flying, Delta Air Lines has the higher typical seat at 8.5/10 — because a flagship cabin on 20% of departures is worth less to you than a very good cabin on all of them.

If you would rather not gamble, Delta Air Lines has the narrowest spread between its best and worst business cabin (5.5 to 9.0), so the downside is the shallowest.

None of these brands are one product. Every carrier here flies the same marketing name over cabins a generation apart, and the deciding variable is which airframe is scheduled on your date. Check the route page or look up the flight number before you decide the brand settled it.

Carrier by Carrier3

United Airlines

10 cabins · 8 aircraft types · 47 routes

9.1

Best seat: United Polaris Business (Elevated Interior) on the 787-9, at 9.1/10. Across everything we observe them flying, the typical seat scores 8.4/10 — a 0.7-point drop from the brochure.

By aircraft

Boeing 787-9 United Polaris Business (Elevated Interior) / United Polaris Business8.4–9.1
Boeing 777-200 United Polaris Business / United First5.1–8.7
Boeing 777-300ER United Polaris Business8.7
Boeing 767-300 United Polaris Business8.5
Boeing 767-400 United Polaris Business8.5
Boeing 787-10 United Polaris Business8.4
Boeing 787-8 United Polaris Business8.4
Boeing 757-200 United Polaris Business5.5

Delta Air Lines

7 cabins · 7 aircraft types · 41 routes

9.0

Best seat: Delta One Suites on the A330-900neo, at 9.0/10. Across everything we observe them flying, the typical seat scores 8.5/10 — a 0.5-point drop from the brochure.

By aircraft

Airbus A330-900neo Delta One Suites9.0
Airbus A350-900 Delta One Suite8.7
Boeing 767-400 Delta One8.6
Airbus A330-300 Delta One8.4
Airbus A330-200 Delta One8.2
Boeing 767-300 Delta One8.1
Boeing 757-200 Delta One5.5

American Airlines

6 cabins · 5 aircraft types · 23 routes

8.7

Best seat: American Airlines Flagship Suite on the 787-9, at 8.7/10. Across everything we observe them flying, the typical seat scores 8.0/10 — a 0.7-point drop from the brochure.

Not every American Airlines business cabin we've measured goes fully flat — First does not.