Shares of Interglobe Aviation , operator of India's largest airline Indigo, fell more than 8% Monday as the carrier grapples with multiple flight cancellations.

Indigo, which operates more than 2,300 flights daily, could only fly 706 flights on Friday following a change in rules about pilots' rest time for pilots, leading to massive disruptions.

On Sunday, the company said in a release that it operated 1,650 flights and it expects "stabilization of the network" by Wednesday.

India's civil aviation minister Ram Mohan Naidu said on Monday that the government has ordered an investigation into the disruptions of Indigo's flight services.

"We will take strict action," the minister said, warning the airline of consequences for "non-compliance."

Passenger woes

Chirag Shah, an

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