Three weeks after an Air India Boeing 787 crashed, investigators are still piecing together what went wrong. In the meantime, aviation safety experts have begun to narrow their thinking.

Spooked by the Air India plane last month that crashed seconds after departing from the Ahmedabad airport, private jet owners who have aircraft registered at the facility are doubling down on safety precautions.

A panel of Indian lawmakers will review safety in the country's civil aviation sector and has invited several industry and government officials to answer questions on July 9, with topics set to include Air India's recent plane crash.