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In page International Civil Aviation Organization:

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Aviation in Russia and China currently use km/h for reporting airspeed, and many present-day European glider planes also indicate airspeed in kilometres per hour.[citation needed] China[4] and North Korea[4] use metres for reporting altitude when communicating with pilots.[4] Russia also formerly used metres exclusively for reporting altitude, but in 2011 changed to feet for high altitude flight. From February 2017, Russian airspace started transitioning to reporting altitude in feet only.[4] Runway lengths are now commonly given in metres worldwide, except in North America where feet are commonly used.[4]