It might make sense for a small airline to order a spare plane, just in case it&#x27;s needed at some point.  Especially if that plane model matches their flight profile really well, but also had a small production run so it would be difficult to lease a replacement.  And if Boing really wants to get sales of the plane to make it look like a success, there might be a sweet price for that extra plane.<p>And since plane age is measured in takeoff&#x2F;landing cycles, a plane that is sitting in storage isn&#x27;t really aging.