NEW : NTSB , Boeing to aid Russian investigation . 4 die in Bahamas plane crash . The Tatarstan Airlines jet had 44 passengers and a crew of six aboard . It crashed in the Black Sea on July 17 after it lost contact with air traffic control over Ukraine. Security official , regional leader 's son aboard crashed jet .
NEW : NTSB , Boeing to aid Russian investigation . The Tatarstan Airlines jet had 44 passengers and a crew of six aboard . It crashed in the Black Sea on July 17 after it lost contact with air traffic control over Ukraine. Security official , regional leader 's son aboard crashed jet .