The Boeing 737 MAX is the bread and butter of Boeing. In 2025, CNBC reported the CEO of Aer Cap, the largest aircraft lessor, as saying that while Boeing does have major defense programs and contracts, its core business is making commercial airplanes. When it comes to commercial airplanes, the Boeing 737 MAX dominates its order book. Of the 6,282 commercial Boeing aircraft currently on order, 4,753 or 75% are Boeing MAX aircraft.