Boeing's Tariff Immunity Is Real — It's the Suppliers Beneath It Who Pay
Section 232 tariffs on aluminum, steel, and derivatives are climbing again in 2026 — but Boeing's fixed-price supplier contracts push the cost downstream, leaving Howmet, TransDigm, and Heico to price it forward while unnamed sub-tier forgers eat the margin hit.
The mechanism: On April 6, 2026, a presidential proclamation restructured Section 232 tariffs on aluminum, steel, and copper so the duty applies to the full customs value of covered articles and derivatives — not just the metal content — and June 2026 amendments expanded product coverage further. Aerospace largely dodged direct finished-aircraft tariffs through "zero-for-zero" civil aviation carve-outs with the EU, UK, and Japan. But the raw billet, plate, and forging stock that becomes engine disks, landing gear, and structural castings still gets hit walking through the door. That cost has to land somewhere in the supply chain — and the market is pricing it as a Boeing problem when it's actually a subcontractor problem.
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