FlightServices_OPS_26.0.xsd

Reference
https://ost.eurocontrol.int/sites/B2BWS/Shared%20Documents/1%20-%20Technical%20Resources/NM%20B2B%20Version%2026.0/00%20-%20LATEST%20EDITION/60%20%20WSDL%20and%20XSD%20(compressed).tar.gz