Neutral unit of construction

The neutral unit of construction or neutral unit of currency (code: NUC) is a private currency used by the airline industry,^[1] to record fare calculation information.^[2] A set of exchange rates is issued by the International Air Transport Association (IATA) every month.^[3] The ticket component prices are converted from the original currency (of the country of commencement of travel) and recorded on the airline ticket.^[4]

neutral unit of construction

Unit
Symbol	NUC‎

The NUC system came into being on 1 July 1989, having superseded the older "Fare Construction Unit" (FCU) system.^[4] As of 2008^[update], the NUC depends on the COC (Country of Commencement) of the travel. Each country that has a strong currency has an IROE (IATA Rate of Exchange) too.^[5]

A similar unit, formerly used by the European railway industry, is the UIC Franc (XFU).^{[citation needed]}