New Delhi, Nov. 15 -- In a breather to low-cost airlines IndiGo and GoAir, aviation regulator Directorate General of Civil Aviation (DGCA) has extended the deadline for replacing their faulty Pratt & Whitney (P&W) engines on their Airbus 320neo aircraft.

The two carriers now have time till November 24 to install modified 'Low Pressure Turbine' (LPT) engines on their planes.

In case of IndiGo, the regulator had directed the carrier to initially change engines in 16 aircraft by November 12. The deadline for GoAir to change the engines in their 13 jets was November 13.

The regulator subsequently asked IndiGo to change glitch-prone engines in 23 aircraft by November 19. But the trouble soon mounted with the regulator directing the airline to...