According to Official Guinness Records,
The largest functioning plane measures 7.13 m (23.39 ft) long, 4.37 m (14.33 ft) tall and 2.10 m (6.88 ft) wide and was achieved by Schreinerei Fust AG (Switzerland) in Wil, St. Gallen, Switzerland, on 6 May 2017.Schreinerei Fust AG's planer used 8 men to move the plane and successfully shave a wooden splint from a wooden plank creating shavings that were as long as 12.75 meters.
For a complete list of 2017 records, please visit 2017 Guinness Records in Switzerland.