India, Dec. 4 -- The Directorate General of Civil Aviation (DGCA) on Wednesday questioned airline IndiGo over its drop in performance in November and has asked the airline to submit the reasons for the current situation, as well as the plans to reduce flight cancellations and delays.

Citing recent operational performance information provided by IndiGo, DGCA said a total of 1,232 flights were cancelled in November, including 755 flights due to crew and FDTL (Flight Duty Time Limitations) constraints.

As many as 258 flights were cancelled due to "airport/airspace restrictions", 92 flights were cancelled due to the ATC (Air Traffic Control) system failure and 127 flights on account of other reasons, the statement said.

In a statement, the D...