Boeing 737-400 vs. Boeing 737 MAX 10

The Boeing 737-400, part of the 737 Classic series, is a narrow-body, twin-engine airliner developed to meet the evolving requirements of the short to medium-haul market. First introduced in 1988, the 737-400 expanded upon the success of its predecessor, the 737-300. The -400 variant entered manufacturing shortly after finalization of design plans between Boeing and launch customer Piedmont Airlines (later merged into US Airways). It gives increased capacity and range, offering an option in between Boeing's 737-300 and the 757-200.

The fuselage incorporated a key 8 foot expansion to enable typical accommodation for up to 170 passengers in a 2-class layout. Other changes included increased weights and structural reinforcements, enhanced avionics/flight controls, and higher thrust CFM powerplants required for the heavier max takeoff figures. Cost efficiencies were achieved keeping cockpit continuity with the ubiquitous 737 flight deck suite.

Spanning 119.6 feet (36.5 meters) in length with a wingspan of 94.5 feet (28.8 meters), the 737-400 was designed to accommodate the growing demand for larger single-aisle aircraft. The aircraft typically seats 144 passengers, providing more space and comfort compared to earlier models in the series. This increased capacity made the 737-400 an attractive option for airlines seeking to transport more passengers on popular routes, without the need for a larger, wide-body aircraft. Equipped with two CFM International CFM56-3C1 engines, the 737-400 delivers a total thrust of 44,000 lbf (196.0 kN). This engine configuration, combined with a fuel capacity of 5,310 US gallons (20,100 liters), allows the aircraft to achieve a range of 2,079 nautical miles (3,850 kilometers).

In the competitive commercial aviation market of its time, the Boeing 737-400 contended with models like the McDonnell Douglas MD-80 series. Its introduction marked another milestone for Boeing in the evolution of the 737 family, solidifying the company's position in the market for short to medium-haul airliners. Airlines such as Alaska Airlines, Turkish Airlines, and British Airways incorporated the Boeing 737-400 into their fleets. The aircraft's operational role was significant, enabling these carriers to expand their route networks and increase flight frequencies, particularly in domestic and regional markets.

The Boeing 737 MAX 10 is the largest variant in the 737 MAX series, representing Boeing's expansion of its narrow-body, twin-engine offerings for the commercial aviation market. Launched in 2017, the MAX 10 was developed in response to airlines demanding a larger model than the MAX 9. The announcement for the MAX 10 was quickly followed by 240 orders and commitments from more than ten customers. The United States' aviation regulator, the FAA, cleared Boeing to begin certification flight testing of its 737 MAX 10 in November of 2023. Deliveries are being anticipated for early 2025.

The 737 MAX 10, with its extended fuselage, offers a greater passenger capacity compared to its siblings in the MAX series at 143 feet (43.79 meters). This increase in size allows airlines to accommodate more passengers per flight, optimizing efficiency and profitability, particularly on popular short to medium-haul routes. Equipped with advanced CFM International LEAP-1B engines, the MAX 10 delivers over 58,000 pounds of thrust. The slight stretch of the MAX 10 allows the jet to retain the existing wing design and LEAP engines from the MAX 9, with a trailing-link main landing gear being the only major change.

In the market, the Boeing 737 MAX 10 competes with aircraft like the Airbus A321neo. Both are very similar in terms of seating capacity, and range, but the MAX 10 does fall short in terms of field performance. Boeing predicts that the MAX 10 will yield a 5% lower trip cost and seat cost compared to the A321neo. It provides airlines with an alternative option in the narrow-body segment, offering a balance of capacity, range, and efficiency.

Various airlines have shown interest in the 737 MAX 10 for its ability to meet the demands of modern air travel. It is expected that United Airlines, Korean Air, Alaska Airlines, and Ryanair will have some of the largest fleets of MAX 10s. The MAX 10's capabilities make it an attractive choice for carriers looking to expand their network and serve densely populated routes efficiently.