S7 Airlines (or Siberian Airlines), Russia’s second-largest carrier, cancelled its order for 15 Boeing B-787 Dreamliner airplanes valued at about 2.6 billion dollars at list prices. It didn’t explain the cancellation. Boeing, two days ago, reported that the orders for the new aircraft reached 895 units for 58 clients in the World, and it recorded only 15 cancellations without disclosing the nam...