American Airlines’ parent company said it would purchase 460 narrow-body planes in a historic deal that gives Europe’s Airbus a new foothold in U.S. markets, Crain’s Chicago Business reported. The order, which AMR Corp. said is the largest in aviation history, calls for American to purchase 200 Boeing 737s and 260 Airbus A320s. Boeing, which has been putting off for more than a year the decision on how to upgrade its 737, salvaged its portion of the order by offering to put a new engine in its best-selling jet. The market for narrow-body jet sales is estimated at $2 trillion over 20 years. The total is split between Boeing and Airbus, which has made significant U.S. inroads with its A320.