United Airlines Holds Hundreds of Unusable Lie‑Flat Seats as 737 MAX 10 Delays Persist

United Airlines has accumulated hundreds of custom lie‑flat business‑class seats for the Boeing 737 MAX 10, a model whose certification has been postponed for years. The airline has publicly admitted that the seats cannot be transferred to any other aircraft type, leaving them effectively stranded. The delay has turned what was a planned fleet upgrade into a costly inventory problem, as the seats sit unused while United waits for the MAX 10 to enter service. The company has no immediate plan to repurpose or sell the seats, and the situation underscores the broader risk of long‑term aircraft certification delays for airlines that invest heavily in bespoke cabin configurations.