The Gurugram-headquartered IndiGo operates over 1,000 daily flights and carries about 40 percent of domestic flyers, while GoAir offers 230 services daily and has a market share of around 10 percent.
The issue grabbed media's attention after a Lucknow-bound IndiGo flight had to make an emergency landing due to engine failure on Monday.
The Directorate General of Civil Aviation on Monday made a decision to ground 11 aircraft hours after an A320 Neo aircraft of IndiGo suffered an engine failure mid-air and was forced to make an emergency landing at the Ahmedabad airport. There are a total of 45 A320 Neo planes fitted with P&W engines.
The aviation sector in the country may remain affected with IndiGo and GoAir likely to face more disruptions in the coming weeks.
The directive followed instances of the engines shut-down during flights and rejected take-offs involving the A320 neo family aircraft.
The move sent passengers and airlines into a tizzy, as thousands of passengers braced for delays and cancellations with ticket prices skyrocketing from their usual band of Rs 8,000-9,000 for late bookings. Passengers are allowed alternate flights without any extra charges apart from an option to reschedule their flights. "Both IndiGo and GoAir have been told not to refit these engines, which are spare with them in their inventory", the Directorate General of Civil Aviation (DGCA) said.
Citing safety of aircraft operations, the DGCA said, A320neos fitted with PW1100 engines beyond ESN 450 have been grounded with immediate effect.