Air India flight AI2379 from Phuket to Delhi on August 4 experienced a sudden 300-foot altitude drop during cruise, injuring 13 passengers and 4 crew members before landing safely. Both pilots underwent psychoactive substance screening, with the pilot-in-command returning a non-negative initial result and testing positive for marijuana per one report. The Aircraft Accident Investigation Bureau is examining the serious incident while the pilots remain off-rostered.