{"as_of":"2026-10-23","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Design","items":[{"count":657,"name":"Waco","note":"","unit":"aircraft on the register","url":"https://eflight.com/makers/waco"},{"count":15,"name":"Waco YKS-6","note":"","unit":"registered","url":"https://eflight.com/models/waco/yks-6?variant=YKS-6"},{"count":null,"name":"Built of steel tube, wood and fabric","note":"A biplane of the 1920s and 1930s: steel-tube fuselage, wooden wings, fabric covering.","unit":"","url":"https://eflight.com/materials/steel-wood-fabric"}],"relation":"made by"},{"group":"Engines","items":[{"count":13,"name":"Jacobs L4 /R755-7","note":"245 hp","unit":"of these aircraft","url":"https://eflight.com/engines/jacobs-l4-r755-7"},{"count":1,"name":"Continental W670 series","note":"250 hp","unit":"of these aircraft","url":"https://eflight.com/engines/continental-w670-series"}],"relation":"powered by"},{"group":"Where they are","items":[{"count":3,"name":"Ohio","note":"","unit":"of these aircraft","url":"https://eflight.com/states/OH"},{"count":3,"name":"California","note":"","unit":"of these aircraft","url":"https://eflight.com/states/CA"},{"count":2,"name":"Wyoming","note":"","unit":"of these aircraft","url":"https://eflight.com/states/WY"},{"count":1,"name":"Washington","note":"","unit":"of these aircraft","url":"https://eflight.com/states/WA"},{"count":1,"name":"Tennessee","note":"","unit":"of these aircraft","url":"https://eflight.com/states/TN"}],"relation":"registered in"},{"group":"Biggest operators","items":[{"count":1,"name":"Waco of Cross LLC","note":"","unit":"of these aircraft","url":"https://eflight.com/search?q=Waco of Cross LLC"},{"count":1,"name":"Waco Air Museum and Aviation Learning Center","note":"","unit":"of these aircraft","url":"https://eflight.com/search?q=Waco Air Museum and Aviation Learning Center"},{"count":1,"name":"Southern Aircraft Consultancy INC Trustee","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/southern-aircraft-consultancy-inc-trustee"},{"count":1,"name":"Dream Waco LLC","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/dream-waco-llc"},{"count":1,"name":"Cal-Aerofab Flight Academy","note":"","unit":"of these aircraft","url":"https://eflight.com/search?q=Cal-Aerofab Flight Academy"}],"relation":"owned by"},{"group":"Record","items":[{"count":0,"name":"NTSB accidents and incidents involving the YKS-6","note":"0 fatal","unit":"cases since 1982","url":"https://eflight.com/models/waco/yks-6#accidents"}],"relation":"involved in"},{"group":"Airworthiness","items":[{"count":18,"name":"Approved modifications for the YKS-6","note":"","unit":"supplemental type certificates","url":"https://eflight.com/models/waco/yks-6#airworthiness"}],"relation":"subject to"},{"group":"Analytics","items":[{"count":null,"name":"Accidents by model, with rates per thousand registered","note":"","unit":"","url":"https://eflight.com/analytics/accidents-by-model"},{"count":null,"name":"The fleet by kind, state and age","note":"","unit":"","url":"https://eflight.com/analytics/fleet"},{"count":null,"name":"Biggest makers and model families","note":"","unit":"","url":"https://eflight.com/analytics/makers"}],"relation":"compared in"}],"graph":"https://eflight.com/graph","graph_index":"https://eflight.com/graph/index.json","license":"https://creativecommons.org/licenses/by/4.0/","node":{"built_of":{"material":"steel-wood-fabric","name":"steel tube, wood and fabric","note":"A biplane of the 1920s and 1930s: steel-tube fuselage, wooden wings, fabric covering."},"id":"waco/yks-6","name":"Waco YKS-6","registered":15,"type":"model","url":"https://eflight.com/models/waco/yks-6","versions":1},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}