New Delhi, Dec. 5 -- After having to cancel hundreds of flights this week due to a shortage of aviators, IndiGo told the aviation regulator its operations will be fully restored by February 10.

Thousands of passengers were stranded again on Thursday, the third day of chaos after India's biggest airline failed to make sufficient changes to its roster planning to accommodate new government regulations.

"The disruptions have arisen primarily from misjudgement and planning gaps in implementing Phase 2 of the (Flight Duty Time Limitations), with the airline accepting that the actual crew requirement exceeded their anticipation," the Directorate General of Civil Aviation (DGCA) said in a statement.

The airline has reportedly asked for relief...