Some family members of 14 victims visit scene of crash . Investigators looking into whether the single-engine plane was overloaded . The NTSB is investigating what caused a small airplane to explode and catch fire in midair over San Diego on Saturday. No recorders aboard ; it 's not clear whether details of the crash will ever be known .
Some family members of 14 victims visit scene of crash . Investigators looking into whether the single-engine plane was overloaded . FAA says 7 children , 7 adults were aboard plane that crashed in Butte , Montana . No recorders aboard ; it 's not clear whether details of the crash will ever be known .