Pilot-in-command Captain Deepak Vasant Sathe, 58, and co-pilot Captain Akhilesh Kumar, 32, were the ones operating the Air India Express flight with 190 that overshot the runway and crashed at the Kozhikode airport in Kerala on Friday night.
Both pilots, along with 16 other people on board, died in the accident.
Air India Express is a wholly owned subsidiary of Air India. The two deceased pilots were not part of either of the two aforementioned unions.
The unions noted, "Whether a landing technique is appropriate or a contributory factor to a mishap can only be ascertained after a thorough, evidence backed investigation and not by speculative, casual remarks."