 Complete the following phrase:  Aeroflots route network had extended to by 1950, and it carried 1,603,700 passengers, of freight and of mail during the same year. Night flights began in the same year, and the 5th five-year plan, covering the period 19511955, emphasised Aeroflot expanding night-time operations, which vastly improved aircraft utilisation. By 1952, some 700 destinations around the Soviet Union received regular flights from Aeroflot. On 30 November 1954, the Ilyushin Il-14 entered service, and the aircraft took a leading role in the operation of Aeroflots all-Union services. The number of passengers carried in 1955 increased to 2,500,000, whilst freight and mail carriage also increased, to 194,960 and 63,760 tons, respectively. By this time, Aeroflots route network covered a distance of some . The 