Maximum Take-Off Weight (MTOW)

Maximum Take-Off Weight (MTOW) is the greatest weight — aircraft, fuel, crew, passengers and cargo combined — at which an aircraft is certified to begin its take-off roll. It's a structural and performance limit set by the manufacturer and regulator, and it constrains the classic trade-off between fuel (range) and payload: fill the seats and you may not be able to fill the tanks, and vice versa.

Why it matters: MTOW is one of the few numbers that follows an aircraft everywhere. It determines the runway performance the aircraft must demonstrate, drives many regulatory category boundaries, and is the basis on which a large share of the world charges for aviation — landing fees, navigation charges and some parking tariffs commonly scale with certified MTOW.

In practice, buyers should treat MTOW as a budget line as well as a performance figure: two otherwise similar aircraft with different certified weights can carry meaningfully different lifetime fee burdens. Some types are offered at more than one certified MTOW, and an increase can sometimes be purchased from the manufacturer — raising payload-range at the cost of higher fees.