Over 350 A320 aircraft of IndiGo and Air India to be grounded for mandatory software upgrade after a JetBlue A320 flight suffered a sudden pitch-down incident on October 30 in USOver 350 A320 aircraft of IndiGo and Air India to be grounded for mandatory software upgrade after a JetBlue A320 flight suffered a sudden pitch-down incident on October 30 in US Latest News [ SOBAN NEWS: International and National ]