The US airline industry has essentially become a triopoly. The nation is dominated today by American Airlines, Delta Air Lines, and United Airlines, and as each essentially sells the same product to customers (flights), they need to find other ways to differentiate, such as offering distinct onboard experiences. For American Airlines, the carrier’s primary premium cabin is its Flagship Business class, which will become its top cabin once the airline phases out Flagship First, while for Delta, its equivalent is DeltaOne.