Why United Has Hundreds of Lie-Flat Seats It Can’t Use

United Airlines currently possesses hundreds of lie-flat seats intended for its Boeing 787 Dreamliner fleet, but these seats remain unusable due to significant delays in Boeing’s certification process for the 737 MAX 10. The primary obstacle preventing immediate deployment is the protracted timeline associated with obtaining regulatory approval from aviation authorities. Consequently, United opted to store the surplus seats on grounded 787 aircraft awaiting further instruction. This situation highlights a complex and unusual challenge within the global aerospace supply chain. Experts suggest that the fate of the 737 MAX 10's original role remains uncertain pending resolution of the certification issues.