The Directorate General of Civil Aviation (DGCA) is doing a “deep dive” on the twin in-flight shutdowns experienced by Pratt & Whitney (PW) engines on two IndiGo Airbus A321 aircraft while operating domestic flights on Tuesday. Now these two aircraft are also grounded, joining the about 40 IndiGo already cooling their heals for months at airports across India as they await replacement engines from PW.