イリヤー・ムーロメツ
The Ilya Muromets continued in production after the war, with only a handful being finished. From May–October 1921, the aircraft was utilized in its originally intended role of passenger transport on the Moscow-Kharkov line; six saw service as a civilian passenger airliner and mail plane. After carrying 60 passengers and two tons of freight, the Ilya Muromets were considered too difficult to maintain as engines and airframes were worn out and on 10 October 1922, the airliners were retired. The last flight of an Ilya Muromets bomber took place in 1922 at the Air Shooting and Bomb-dropping School in Serpukhov.