In yet another replacement of Russian aircraft on Russian domestic routes, 
  Aeroflot has announced that from the 30th of October it replaced the Tu-154 
  on the Moscow-Nizhnevartovsk route with a Boeing-737-400. The operation of 737s 
  by Transaero on the route has no doubt helped the increasingly domestically 
  competitive flag carrier, in making the decision. 
Opened in 1999, to service the large concentration of oil and industrial enterprises 
  in the area, Aeroflot operates the route 4 times a week. It also believes that 
  the aircraft replacement will attract other passengers transiting to Moscow 
  through Nizhnevartovsk from other cities of Khanti-Mansiisk autonomous district.
According to Aeroflot the average seat load factor on the route during 2000 
  has been 72% and during the summer months has risen to 96%. On the 1st November 
  2000 Aeroflot opened a representative office in Nizhnevartovsk with the objective 
  of further developing business in the region. The addition of the 737 flights 
  to Nizhnevartosvsk from Moscow brings the number of destinations served by 737s 
  to six including Yekaterinburg, Novosibirsk, Omsk, Ufa, and Krasnodar. With 
  Aeroflot recently deciding to introduce the B-737 route to Murmansk at the end 
  of March 2001. The choise of high volume routes for the operation of the aircraft 
  reflecting Aeroflot's need, in contrast to its Russian aircraft, to meet monthly 
  leasing costs. Efficient utilization is therefore a prerequisite for the airline.