With tariffs in the news and their anticipated effect on aviation, I had to dig deeper into the Boeing 737 supply chain. Inspired by a video from my favorite aviation channel, Mentour Pilot, I learned that many of the airplane's parts are sourced from around the world. But I had no idea that the number of countries and companies was so vast. Using a PDF from Airframer.com from April 2025, I mapped the 24 countries supplying over 100 parts and raw materials for the airplane to the plane itself in this diagram.

It starts to feel like the 737 is only assembled in the USA.