A lighter airframe structure allowed to achieve a longer range than La-7. There were made only 16 pieces of La-9 because the production of improved type La-11 has been started. It's prototype (La-140) passed the flight tests in May 1947. The La-11 was determined to be an escort fighter with Tu-2 and Tu-4.
As a result of a removal of a cannon, its flying range increased; hence, 3 remained cannons NS-23 were situated on the fuselage asymmetrically. The engine cooler was shifted from its world classic place under the fuselage (by La-9 directly to the engine cowling (by La-11), also improving aerodynamics of fighter. The La-11 was provided with ice-removing device from wing leading edges, a stabilizer and propeller cone. Otherwise, both types did not differ significantly from each other : their construction was congruent.
The La-11's were used in air forces of the USSR, Northern Korea and China. They were fighting in the initial combats in Korea, used above all as fighter-bombers. There were produced 1500 pieces of La-11. They fulfilled an important role in period of transition before the firs jets fighters come to use.
page 9: "640 La-9 were used in Air Force and 245 in the Air Defense Aviation by the midyear 1951."
page 19: "1559 combat aircrafts were built by serial production in 1946..1948 years."
This is by 383 aircrafts more than La-11 (see page 28).