Interglobe Aviation (IndiGo) has received a 'Buy' upgrade from Motilal Oswal, with a projected 27% upside.IndiGo has placed orders for 925 aircraft, which is one of the largest fleet expansions in global aviation history.The airline has been making progress by gaining market share, expanding its international and cargo business, and adding new destinations/routes.IndiGo stock currently trades at a P/E of 20x FY26 EPS and 9.7x FY26E EV/Ebitda.