Passengers are likely to face harrowing times with IndiGo and GoAir deciding to cancel more than 600 flights this month, of which 488 are by IndiGo alone, following grounding of 11 A320 neo planes with faulty Pratt & Whitney (P&W) engines. The cancellations by the two budget carriers, which operate more than 1,200 flights daily on average, may significantly disrupt the summer schedule.