DUBAI, United Arab Emirates (AP) — FlyDubai, the lower-cost sister airline to long-haul carrier Emirates, announced an order Tuesday for 150 Airbus A321 aircraft at the Dubai Air Show — a major purchase that will see the carrier for the first time expand its fleet beyond Boeing. Airbus and FlyDubai offered no value for the deal, but it will be well into the billions of dollars. It also represents a major purchase for the airline as Dubai prepares across both carriers to expand as it builds a