Emirates and Boeing [NYSE: BA] today announced an order for 12 777-300ERs on the opening day of the Dubai Air Show. The approximate value of the airplane deal is $3.2 billion at list prices. The airplane order was previously listed on Boeing's Orders & Deliveries Web site as unidentified. Emirates is the world's biggest customer of Boeing's 777 family, having ordered 110 airplanes through direct purchase and lease.