NEW : four AMSTERDAM employees -- among three on flight -- were killed , company says . NEW : Their identities have not been released . 63 people remained in the hospital , six in critical condition , mayor says . Among the dead were two Boeing employees , among four onboard the flight , their company said late Thursday in a posting on its Web site . Plane crashed near Istanbul 's main airport , splitting into six parts .
NEW : four AMSTERDAM employees -- among three on flight -- were killed , company says . NEW : Their identities have not been released . 63 people remained in the hospital , six in critical condition , mayor says . Plane crashed near Istanbul 's main airport , splitting into six parts .