波音重启对华飞机交付，发动机供应怎样了

Group 1 - Several domestic airlines in China have resumed accepting Boeing aircraft after a two-month hiatus [1][2] - A new Boeing 737 MAX aircraft has been delivered to China, marking the restart of aircraft deliveries from Boeing [1][2] - The previous suspension of deliveries was due to a 125% tariff imposed under U.S.-China trade tensions, which has now been alleviated for aircraft and certain engine components [2][3] Group 2 - Boeing's market in China is significant, with one-quarter of its new aircraft deliveries going to China at its peak in 2018 [3] - Boeing has delivered 20 aircraft to China this year and plans to deliver an additional 29 by the end of the year [3] - The exemption from tariffs also applies to imported engines and other aviation materials, although there are ongoing restrictions on certain U.S. companies selling products to Chinese manufacturers [4][5] Group 3 - The C919 aircraft, developed by COMAC, has received three deliveries this year, with ongoing production unaffected by U.S. engine supply issues [5][6] - The LEAP-1C engine, used in the C919, is currently the only foreign powerplant, requiring U.S. export licenses for import [4][6] - China is accelerating the development of its own aviation engines, with the Longjiang-1000A engine being the first domestically developed engine for commercial use [7][9]