Air India A320 incident: Why loss of all 3 hydraulic systems matters and what AAIB report still doesn't explain

The AAIB’s preliminary findings have shifted attention from turbulence to a rare triple hydraulic-system failure on the Air India A320 Phuket-Delhi flight. Aviation experts Sam Thomas and Sanjay Lazar explain why the failure is significant, what investigators still need to establish, and why the pilot’s drug-test finding should be examined separately.