United Airlines 2020 Boeing 787-9 Dreamliner N25982 c/n 66139 A/C bay. A/C bay supplies air to the p

United Airlines 2020 Boeing 787-9 Dreamliner N25982 c/n 66139 A/C bay. A/C bay supplies air to the passenger cabin. A/C bay receives hot air from the engines and is cooled in the A/C bay then sent to the passenger cabin. San Francisco Airport 2022.