Vistara flight delays, cancellation: Vistara has been in the news this week, with reports suggesting close to 100 flight cancellations. The airline grounded nearly 50 flights on Monday, April 1, and that number is expected to climb to 60 today, April 2. Are you a Vistara passenger facing a delay or cancellation? Here's what you should know about the DGCA rules for flight delays and cancellations.