The country's largest airline, IndiGo, on Sunday cancelled over 650 flights, while the disrupted operations were slowly stabilising as the number of cancellations reduced and more than Rs 610 crore worth of ticket refunds were processed for the affected passengers. The airline expects operations to stabilise by December 10. The civil aviation ministry, which has taken various measures, including capping airfares and directing IndiGo to expedite the ticket refund process, on Sunday said air travel operations across the country are stabilising at a fast pace. The ministry also said IndiGo has processed Rs 610 crore refunds and delivered 3,000 pieces of baggage to passengers across the country as of Saturday. In a video message to the staff, IndiGo CEO Pieter Elbers said, "step by step, we are getting back" and that the airline's on time performance (OTP) is expected to be 75 per cent.