Imagine being a supply chain executive in Boeing. After a barrage of announcements about tariffs in the United States, you would be forgiven for being swivel-eyed from the rapidly changing geo-political agenda while trying to build large and complex long-life assets.  Yet this is now the daily reality in one of America’s most important industrial companies. Its arch-competitor, Airbus, has only one country to worry about selling into post-tariffs: the US. Boeing has to fret about every one of those countries targeted by American tariffs and the risks that countermeasures damage its existing and future customer campaigns.  This Tuesday morning…