Banc Sabadell | According to Reuters, Airbus (AIR) is reportedly the favourite (over Boeing) to win IndiGo’s 500 A320 aircraft order, making it the industry’s largest order by volume (versus one for 470 aircraft placed by Air India a few months ago). On the other hand, both Airbus and Boeing are reportedly also competing to sell 25 aircraft (AIR’s A330neo or Boeing’s 787) to the same airline. No statement has…