New Delhi: The Aircraft Accident Investigation Bureau (AAIB) of India has taken up the investigation of the Air India Phuket-Delhi flight that faced severe turbulence last week leading to injuries to passengers. An Air India Airbus A320 aircraft, registration VT-EXO, operating scheduled flight AI 2379 from Phuket to Delhi on last Monday, experienced a sudden altitude variation of approximately 300 feet during cruise. The aircraft was carrying 137 passengers, including three infants, and eight crew members comprising two pilots and six cabin crew. The AAIB added that it is presently engaged in the systematic collection, preservation and examination of all relevant technical, operational, medical and human-factor evidences. The AAIB remains committed to an independent, transparent and professional investigation, with aviation safety as its overriding objective,” the investigating body said.