All aircraft are delivered with Weight Variants that determine the payloads that a given aircraft can fly with.
A Weight Variant (WV) is defined by three design weights, which are computed based on aircraft strength and airworthiness requirements and that limit operational use of the aircraft:
The declared weights of an aircraft and therefore its Weight Variant are a key element in determining the airport and navigation charges an airline will pay for a given route.
From an operational standpoint, higher design weights allow operators to increase the capabilities of the aircraft (payload and/or range).
However, ANSP (Air Navigation Services Providers) and airports charge fees to cover the use of their services, infrastructure and equipment on ground and all along the flight.
Most of these charges are based on the MTOW (or MLW in some regions).
The Multiple Weight Variants (dual or more) option is a great alternative, with more flexibility over time and unlimited switches. You can adapt quickly and continuously with fast-evolving networks to address passenger and cargo demand in the best way.