The Budget passenger carrier Indigo has canceled as many as 47 flights today after India's aviation regulator Directorate General of Civil Aviation (DGCA) grounded eight A320Neo planes of IndiGo with faulty Pratt & Whitney engines, along with three such aircraft of GoAir.

Indigo announced on its website that it has canceled 47 of its domestic flights across Delhi, Mumbai, Chennai, Kolkata, Hyderabad, Bangalore, Patna, Srinagar, Bhubaneswar, Amritsar, Srinagar and Guwahati among others, on March 13th.

The decision comes after an Indigo flight bound for Lucknow, returned to Ahmedabad within 40 minutes of it getting airborne due to a mid-air engine failure. The DGCA said in an order on March 12 that 320 Neos fitted with PW1100 engines beyond ESN 450 were to be grounded with immediate effect.

Indigo operates around 1,000 flights on a daily basis, carrying 40% of India's domestic flyers, while GoAir makes up for 10%.