What does YK stand for?

Cyprus Turkish Airways - ICAO designator (AD)

Japan - Yugen Kaisha

RADAR Beacon - Maps and charts

Syria - Civil aircraft markings - international (PIPO)

Yakovlev - Former USSR - ICAO aircraft manufacturer identifier (ICAO)

Yankee Airlines (SAUS)

Yapi-Kredi Bank - Turkey

Yoke (SAUS)

Yom Kippur (BJA)

York Antibodies - Immunology