The 5 Airlines With The Largest Boeing 737 Fleets In Early 2026

For decades, the Boeing 737 has been one of the defining aircraft in short and even medium-haul markets. However, its operational importance is best understood by the airlines that have built entire network strategies around the type. From Southwest Airlines’ to Ryanair and its ultra-low-cost expansion across Europe, the aircraft has proven itself as a key workhorse for low-cost operators.