{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Covers","items":[{"count":9,"name":"Ryan Aeronautical ST-A SPECIAL","note":"","unit":"registered","url":"https://eflight.com/models/ryan-aeronautical/st-a-special"}],"relation":"covers"},{"group":"Held by","items":[{"count":null,"name":"Ryan Aeronautical Company","note":"","unit":"","url":"https://eflight.com/holders/ryan-aeronautical-company"}],"relation":"held by"},{"group":"More","items":[{"count":null,"name":"Every type certificate","note":"","unit":"","url":"https://eflight.com/certificates"},{"count":null,"name":"Who holds what","note":"","unit":"","url":"https://eflight.com/holders"}],"relation":"see also"}],"graph":"https://eflight.com/graph","graph_index":"https://eflight.com/graph/index.json","license":"https://creativecommons.org/licenses/by/4.0/","node":{"faa_document":"https://drs.faa.gov/browse/excelExternalWindow/A3D2DDFA25C59B048525673D00631233.0001","holder":"Ryan Aeronautical Company","id":"ATC 681","models":["ST-A Special"],"name":"Type certificate ATC 681","product_type":"Aircraft","type":"certificate","url":"https://eflight.com/certificates/ATC 681"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}