{"as_of":"2026-10-07","attribution":"FAA and NTSB data via eFlight Registry (https://eflight.com)","connections":[{"group":"Held by","items":[{"count":null,"name":"Douglas Aircraft CO. INC.","note":"","unit":"","url":"https://eflight.com/holders/douglas-aircraft-co-inc"}],"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/43220EA5C959483385256735004D595A.0001","holder":"Douglas Aircraft Co. Inc.","id":"ATC 540","models":["Army C-39","Army C-42","DC-2 (Army C-32; C-32A; C-34; Navy R2D-1)"],"name":"Type certificate ATC 540","product_type":"Aircraft","type":"certificate","url":"https://eflight.com/certificates/ATC 540"},"source":"FAA Civil Aviation Registry, FAA airport file, NTSB accident database; assembled by eFlight Registry"}