India, Dec. 5 -- Air travel across India is in turmoil for a fourth consecutive day after IndiGo-the country's largest airline-cancelled 500 flights, including all departures from New Delhi, resulting in chaos across major airports.

"These last few days we have a serious operational crisis," IndiGo operator InterGlobe Aviation Ltd. said in a statement on Friday. "While this will not get resolved overnight, we assure you we will do everything in our capacity to help you in the meantime."

At many airports across the country, crowds of stranded passengers voiced their frustrations, aggressively arguing with staff. Social media platforms and local media were flooded with videos of angry travellers. They have missed important interviews, mee...