In order to improve the range of the La-9 to protect Tu-4 bombers during their missions a new long-range prototype was built. Initially named Aircraft "134" or La-9M the fighter made its maiden flight in May 1947. It was armed with three NS-23 guns. A few days later the second prototype — the "134D" was completed. The fuel capacity was increased from 825 to 1,100 liters. This required the introduction of a strengthened undercarriage with high-pressure tires. The fighter was named La-11 and serial production soon began.
   One of the most interesting chapters in the career of the La-11 was the so-called Northern Expedition. In 1948 the decision was made to establish an air force base near the North Pole. This was the only place to base Tu-4 Bulls so they could reach their targets deep in USA territory. Lavochkin fighters were intended to provide an air defense as well as to prevent American aircraft activity in this region. The support was provided by Li-2s of the 650th Transport Regiment, C-47s of the 1st Transport Regiment, and llyushin ll-12s of the 708th Transport Regiment. A Tupolev Tu-6 (the reconnaissance version of the Tu-2) would be employed as a pathfinder/leader aircraft. On 7 May 1948 one Tu-6 and three La-1 Is landed at the ice airstrip near the North Pole and the next day they flew several training missions from the unusual base. Several such expeditions were carried out by the fighters of the 1st Fighter Division and 53rd Fighter Regiment.
   The combat career of the La-11 began on 8 April 1950, when a flight of the 30th Guard Fighter Regiment intercepted and shot down a USAF RB-44 reconnaissance aircraft near Libava. The same year another American spy plane — the P-2V Neptune — fell victim to the La-11 lethal cannons. In summer 1950 some 60 La-1 Is of the 351 Night Fighter Regiment were delivered to China and took part in Chinese Civill war. On 2 April 1951 flight commander Guzhov and his wing man shot down two Cuomintang F-51 fighters. On 13 June 1951 the regiment was moved to Anshan and started operations against American bombers in North Korea. Soon Lt. Kurganov scored his first victory having destroyed a B-26 Invader. At the beginning of 1952 the regiment included two squadrons — one equipped with MiG-15s and another with La-1 Is. The United Air Army (Korean and Chinese pilots) also received a number of La-9 and La-11 fighters. The Lavochkin La-9 and La-11 became the last generation of Soviet piston fighters — the jet age had begun.