New Delhi, Dec. 5 -- Amid row over massive IndiGo flight cancellations, Congress MP Shashi Tharoor on Friday called it unfortunate and said the airline needs to do "some serious introspection".

He also said the Directorate General of Civil Aviation (DGCA) had numerous warnings to the airline about the new system of working hours and rosters.

The crisis at IndiGo stems from new regulations that boost pilots' weekly rest requirements by 12 hours to 48 and allow only two night-time landings per week, down from six.

IndiGo has attributed the mass cancellations to "misjudgment and planning gaps".

While talking to reporters, Congress MP Shashi Tharoor said, "This is most unfortunate. As far as I understand, the DGCA had given plenty of warn...