Directorate General of Civil Aviation (DGCA) had flagged issues related to the over-usage of several aircraft components to three top-level officials of Air India. The regulator had raised these concerns in a show cause notice issued to the officials' days ahead of the Ahmedabad plane crash in June. A day after sending the notice, the watchdog had sent a warning letter to Air India CEO Campbell Wilson and its head of engineering, flagging problems with malfunctioning business class seat belts in a flight to Toronto, the Economic Times reported.