Experts have begun analysing the voice and flight data recorders from the scene of an Air India plane crash.
A total of 158 people died when a Boeing 737-800 aircraft crashed off a hilltop runway in the city of Mangalore.
Eight people survived after being thrown out of the Air India Express plane when it broke in two.
US investigators are helping in the inquiry, along with a team from Boeing.
Airline officials insist the pilot and co-pilot were experienced and that all procedures for using so-called table-top runways were respected.
Air India has already announced interim compensation for the victims’ families. The government has also announced separate payments.
This was India’s worst air disaster in more than a decade, though a series of near misses at airports, including Delhi and Mumbai, have been the focus of previous debates about safety.