Every commercial aircraft has two published range figures that look like they belong to different planes. The Boeing 777-200LR is a perfect example: its ferry range is 11,500 nautical miles — enough to fly London to Los Angeles and keep going another 2,000 nm. Its maximum payload range is 7,500 nautical miles. The gap between those two numbers is 4,000 nm. That's the entire width of the North Atlantic, twice over. The aircraft that can almost circle the globe empty cannot fly Dubai to Los Angeles at full capacity.

Why the Gap Exists: The Weight Ceiling

Every aircraft has a Maximum Takeoff Weight (MTOW) — a hard structural and aerodynamic limit. The weight budget at takeoff must cover the airframe, fuel, passengers, bags, and cargo. When you maximize one, the others must give way.

At ferry range, the cabin is empty. No passengers, no cargo, minimal crew. Every kilogram of weight capacity that would have been payload is instead fuel. The aircraft takes off near MTOW, but almost all of that weight is jet fuel. Range is maximized.

At maximum payload range, the cabin and hold are at structural capacity — every seat filled, cargo hold at its weight limit. The aircraft is at its Maximum Zero Fuel Weight (MZFW). Adding fuel beyond what the MTOW ceiling allows becomes physically impossible. The aircraft flies as far as that constrained fuel load permits.

The Gap Varies Dramatically by Aircraft

Not all aircraft have the same ferry-to-payload gap. The size of the gap tells you how range-focused the design is:

• Boeing 777-200LR: Ferry 11,500 nm / Max payload 7,500 nm → 4,000 nm gap
• Boeing 787-9 Dreamliner: Ferry 10,100 nm / Max payload 8,100 nm → 2,000 nm gap
• Airbus A350-900: Ferry 9,700 nm / Max payload 8,100 nm → 1,600 nm gap
• Boeing 787-8 Dreamliner: Ferry 8,200 nm / Max payload 7,355 nm → 845 nm gap

The Boeing 777-200LR's enormous gap reflects its purpose: it was designed specifically for ultra-long-haul routes where the aircraft will routinely fly below full load to achieve its range. The Boeing 787-8's smaller gap reflects a more balanced design — less extreme on range, more efficiently loaded on typical missions.

The Slider Is the Payload-Range Curve

On PlaneRange, the passenger slider moves you along the payload-range curve in real time. At zero passengers, you're near ferry range — the ring is at its largest. Drag toward full load and the ring contracts, faster and faster as you approach structural capacity, because the range curve is concave: it degrades slowly at light loads and steeply near maximum payload.

Load the Boeing 787-9 Dreamliner and drag the slider from empty to full. The ring shrinks by 2,000 nautical miles — the difference between comfortably reaching Tokyo from New York and needing a fuel stop somewhere in the Aleutians.