{"as_of":"2026-10-27","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":7,"name":"Waco DSO","note":"","unit":"registered","url":"https://eflight.com/models/waco/dso?variant=DSO"},{"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":1,"name":"Wright HISPANO A&I","note":"150 hp","unit":"of these aircraft","url":"https://eflight.com/engines/wright-hispano-a-i"},{"count":1,"name":"Hispano E","note":"180 hp","unit":"of these aircraft","url":"https://eflight.com/engines/hispano-e"},{"count":1,"name":"Continental W670 series","note":"250 hp","unit":"of these aircraft","url":"https://eflight.com/engines/continental-w670-series"},{"count":1,"name":"Continental R670-series","note":"225 hp","unit":"of these aircraft","url":"https://eflight.com/engines/continental-r670-series"}],"relation":"powered by"},{"group":"Where they are","items":[{"count":2,"name":"California","note":"","unit":"of these aircraft","url":"https://eflight.com/states/CA"},{"count":1,"name":"Oregon","note":"","unit":"of these aircraft","url":"https://eflight.com/states/OR"},{"count":1,"name":"Ohio","note":"","unit":"of these aircraft","url":"https://eflight.com/states/OH"},{"count":1,"name":"Montana","note":"","unit":"of these aircraft","url":"https://eflight.com/states/MT"},{"count":1,"name":"Minnesota","note":"","unit":"of these aircraft","url":"https://eflight.com/states/MN"}],"relation":"registered in"},{"group":"Biggest operators","items":[{"count":1,"name":"Western Antique Aeroplane And Automobile Museum","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/western-antique-aeroplane-and-automobile-museum"},{"count":1,"name":"Rare Aircraft LTD","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/rare-aircraft-ltd"},{"count":1,"name":"Flying L Aircraft INC","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/flying-l-aircraft-inc"},{"count":1,"name":"Artemis Aviation Group LLC","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/artemis-aviation-group-llc"}],"relation":"owned by"},{"group":"Record","items":[{"count":1,"name":"NTSB accidents and incidents involving the DSO","note":"0 fatal","unit":"cases since 1982","url":"https://eflight.com/models/waco/dso#accidents"}],"relation":"involved in"},{"group":"Airworthiness","items":[{"count":1,"name":"Approved modifications for the DSO","note":"","unit":"supplemental type certificates","url":"https://eflight.com/models/waco/dso#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/dso","name":"Waco DSO","registered":7,"type":"model","url":"https://eflight.com/models/waco/dso","versions":1},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}