India, Dec. 6 -- The Directorate General of Civil Aviation (DGCA) on Saturday issued a show-cause notice to IndiGo CEO Pieter Elbers after a week-long operational crisis hit the airline's scheduled flights, causing severe inconvenience and distress to passengers.

In the notice, the regulator said the primary reason for delays and cancellations appeared to be the airline's failure to make adequate arrangements for the revised Flight Duty Time Limitations (FDTL) scheme. The DGCA observed that the disruption indicated major lapses in planning, oversight and resource management by the airline.

"It has been observed that scheduled flights of M/s IndiGo Airlines have recently faced massive disruptions, resulting in severe inconvenience, hards...