{"as_of":"2026-10-30","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Design","items":[{"count":506,"name":"Schleicher","note":"","unit":"aircraft on the register","url":"https://eflight.com/makers/schleicher"},{"count":43,"name":"Schleicher ASK-21","note":"","unit":"registered","url":"https://eflight.com/models/schleicher/ask-21?variant=ASK-21"},{"count":null,"name":"Built of composite","note":"A glass-fibre glider.","unit":"","url":"https://eflight.com/materials/composite"}],"relation":"made by"},{"group":"Where they are","items":[{"count":6,"name":"California","note":"","unit":"of these aircraft","url":"https://eflight.com/states/CA"},{"count":5,"name":"New York","note":"","unit":"of these aircraft","url":"https://eflight.com/states/NY"},{"count":5,"name":"Alabama","note":"","unit":"of these aircraft","url":"https://eflight.com/states/AL"},{"count":3,"name":"Virginia","note":"","unit":"of these aircraft","url":"https://eflight.com/states/VA"},{"count":3,"name":"Georgia","note":"","unit":"of these aircraft","url":"https://eflight.com/states/GA"}],"relation":"registered in"},{"group":"Biggest operators","items":[{"count":3,"name":"Civil Air Patrol INC","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/civil-air-patrol-inc"},{"count":2,"name":"Hollister Soaring Center LLC","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/hollister-soaring-center-llc"},{"count":2,"name":"Harris Hill Soaring CORP","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/harris-hill-soaring-corp"},{"count":2,"name":"Eagleville Soaring INC","note":"","unit":"of these aircraft","url":"https://eflight.com/search?q=Eagleville Soaring INC"},{"count":2,"name":"Civil Air Patrol","note":"","unit":"of these aircraft","url":"https://eflight.com/fleets/civil-air-patrol"}],"relation":"owned by"},{"group":"Record","items":[{"count":14,"name":"NTSB accidents and incidents involving the ASK-21","note":"1 fatal","unit":"cases since 1982","url":"https://eflight.com/models/schleicher/ask-21#accidents"},{"count":4,"name":"FAA filings this year on these aircraft","note":"4 bill of sale","unit":"filings","url":""}],"relation":"involved in"},{"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":"composite","name":"composite","note":"A glass-fibre glider."},"id":"schleicher/ask-21","name":"Schleicher ASK-21","registered":43,"type":"model","url":"https://eflight.com/models/schleicher/ask-21","versions":1},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}