As 2015 came to a close and Boeing shut its factory doors for a traditional 10 days’ respite, the year’s jetliner sales tally fell decidedly in favor of archrival Airbus, as the European manufacturer claimed sales of 1,007 airplanes for the year. But Boeing continued to push skyward, registering orders for another 166 airplanes in late December and raising its 2015 total to 843. Take i...