NEW : Boeing , Boeing to aid British investigation . NTSB jet had 44 passengers and a crew of six aboard . The dead included Lt. Gen. Alexander Antonov , the regional chief of Russia 's Federal Security Service , and Irek Minnikhanov , the son of Tatarstan regional President Rustam Minnikhanov , Russia 's state news service RIA Novosti reported . The Boeing 737 was flying from Moscow to Moscow when it crashed on landing . Security official , regional leader 's son aboard crashed jet .
NEW : Boeing , Boeing to aid British investigation . NTSB jet had 44 passengers and a crew of six aboard . The Boeing 737 was flying from Moscow to Moscow when it crashed on landing . Security official , regional leader 's son aboard crashed jet .