Budget carrier IndiGo has grounded one more Airbus A320 neo plane after it was forced to return to Bhubaneswar following high engine vibrations experienced by the aircraft on the way to Bengaluru. Since their induction in March last year, the A320 neo planes in IndiGo fleet are going out of operations at a regular interval due to the frequent glitches in the Pratt & Whitney engines, which power these planes. The airline currently has 140 A320s, of which 23 are A320 Neos. Though the US engine maker has started supplying new engines to the country's largest airline by market share which has helped it put some of the grounded planes back into flying, many of such planes remain out of operations.