Editing Maximum takeoff weight (section)

==Multiple MTOW==
It is possible to have an aircraft certified with a reduced MTOW, lower than the structural maximum, to take advantage of lower MTOW-based fees, such as insurance premiums, landing fees and air traffic control fees are MTOW based.<ref name="CAA"/><ref>{{cite web |url=http://www.icao.int/publications/Documents/9082_cons_en.pdf|access-date=15 September 2013|title=ICAO's Policies on Charges for Airports and Air Navigation Services }}</ref> This is considered a permanent modification.<ref name="CAA"/>

Alternatively, holders of an Air Operator Certificate (AOC) may vary the Maximum Declared Take-Off Weight (MDTOW) for their aircraft. They can subscribe to a scheme, and then vary the weight for each aircraft without further charge.<ref name="FODCOM">{{cite web | url=https://publicapps.caa.co.uk/modalapplication.aspx?appid=11&mode=detail&id=3583 | title=Fodcom 20/09 }}</ref><ref name="CAA">{{cite web | url=https://www.caa.co.uk/commercial-industry/aircraft/operations/aircraft-insurance/ | title=Aircraft insurance &#124; Civil Aviation Authority }}</ref>

An aircraft can have its MTOW increased by reinforcement due to additional or stronger materials. For example, the [[Airbus A330]] 242 tonnes MTOW variant / [[Airbus A330neo|A330neo]] uses [[Aluminium alloy#Aluminium–scandium|Scandium–aluminium]] (scalmalloy) to avoid an [[Operating empty weight|empty weight]] increase.<ref>[http://www.flightglobal.com/news/articles/farnborough-airbus-outlines-a330neo-engineering-demands-401664/ FARNBOROUGH: Airbus outlines A330neo engineering demands]</ref><ref>[http://www.technology-licensing.com/etl/int/en/What-we-offer/Technologies-for-licensing/Metallics-and-related-manufacturing-technologies/Scalmalloy.html Scalmalloy aluminum-magnesium-scandium alloy] {{Webarchive|url=https://web.archive.org/web/20160815181052/http://www.technology-licensing.com/etl/int/en/What-we-offer/Technologies-for-licensing/Metallics-and-related-manufacturing-technologies/Scalmalloy.html |date=15 August 2016 }} Airbus Technology</ref><ref>[https://3dprint.com/220033/scalmalloy-aircraft-material/ Metal 3D Printing Material Scalmalloy Could be the Aircraft Material of the Future.  3DPrint.com,  Sarah Saunders. Jul 20, 2018.]</ref>