FAQs: RegulationsThird Country Operators (TCO)Applicability We are a U.S. 14 CFR Part 135 operator. Do I need to hold an authorisation if I intend flying commercially to Europe? Answer Yes. Part-TCO is fully applicable to flights conducted under an U.S. 14 CFR Part 135 certificate. Last updated: 23/11/2016 Was this helpful? Vote up 12 Vote down 3