New Delhi, Dec. 13 -- The Directorate General of Civil Aviation (DGCA) on Friday suspended four flight operations inspectors (FOIs) in a tacit admission of regulatory gaps during the IndiGo scheduling meltdown that affected millions of flyers this month even as the embattled airline's chief appeared before the regulator for a second day running.

These inspectors are senior officials who work as part of DGCA's regulatory and safety oversight functions, often deployed to monitor airline operations. "Contracts of these FOIs with the DGCA have been terminated in relation to the recent IndiGo crisis," an official said, citing the order dated December 11.

The officers are Rishi Raj Chatterjee, consultant, deputy chief FOI, Seema Jhamnani, sen...