LAS VEGAS—India’s Aircraft Accident Investigation Bureau (AAIB) is now looking into the June 12 crash of an Air India Boeing 787-8 as an intentional act, says veteran safety consultant and former NTSB investigator Greg Feith.

With 260 casualties and only one surviving passenger, the Air India 171 crash is one of the deadliest aviation incidents in recent history — and so far it’s proving to be one of the most frustratingly opaque.

PEOPLE spoke to aviation expert Anthony Brickhouse about the tragic June 12 crash that killed 241 passengers and crew members. A black box recording suggested the captain of the ill-fated Air India flight had turned off the plane’s fuel switches shortly before the crash.

International airlines from South Korea and India are preparing to inspect its Boeing fleets following findings from the Air India crash investigation.

A preliminary investigation into the crash of an Air India passenger jet last month that killed 260 people raises additional questions about the incident and the investigation is far from over, Air India's CEO said in a memo on Monday.