to replace its 51 Boeing 767s in a deal potentially worth $14 billion at list prices, and was in talks with both Airbus and Boeing, for their A330neo and 787. United operates 128 757s and 767s ( B757s and 51 B767s), the second-largest combined fleet after Delta Air Lines with 206 ( 757s and 767s). Both have to replace them; they could be replaced by 737 MAX 10s, A321neos, Boeing NMAs, 787-8s or A330-800s. On June 3, 2021, United announced that a deal had been confirmed with Boom Supersonic to purchase at least 15 of their Overture supersonic airliners & potentially up to 50 in total. These aircraft will be flown on 100% sustainable fuels. The aircraft are intended to enter service with United in 2029 & are expected to be the first supersonic airliners to fly domestically for an airline since the Concorde was retired with British Airways & Air France in 2003. On June 29, 2021, United announced an order for 270 aircraft valued at around $15 billion: 150 737 MAX 10 aircraft, 50 737 MAX 8 aircraft, and 70 A321neo aircraft. As new aircraft arrive, the airline also announced these will include AVOD (Audio and Video On Demand) screens on every seat, as well as the retrofit of all mainline aircraft to include AVOD screens by 2025. United has also announced the retirement of older mainline aircraft and at least 200 single-class regional aircraft. The 737 MAX 8 aircraft debuts with the airline this summer while 737 MAX 10 and A321neo aircraft start delivery in 2023. United also expects to create 25,000 union jobs, mostly in United States hubs locations, by 2026. The order would be valued at $35.4 billion based on the listed price of the jets. Cabin United Polaris Business Polaris is United's international business class product. The Polaris seat converts into a 6' 6" flatbed, and boasts multiple storage areas, mood lighting, multiple charging ports, lumbar support, and improved dining and amenity services. The modern Polaris seats can be found on all Boeing 767-300ERs, Boeing 777-300ERs, and Boeing 787 Dreamliners, and internationally configured Boeing 777-200ERs, and are being rolled out on the Boeing 767-400ER. On these aircraft, the cabins are configured to provide aisle access to every passenger, with 767s featuring a 1-1-1 seat configuration while 777s and 787s have a 1-2-1 seat configuration. Boeing 757-200s and most 767-400ERs feature United's older BusinessFirst seats