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Purpose of This Notice. This notice provides revised guidance for Federal Aviation Administration (FAA) certificate-holding district offices (CHDO) and principal operations inspectors (POI) assigned to operators conducting airplane operations under Title 14 of the Code of Federal Regulations (14 CFR) parts 91 subpart K (part 91K), 121, 125 (including the Letter of Deviation Authority (LODA) part 125 subpart M (part 125M) operators), and 135. This notice amends and clarifies the authorization (B035) for Class I navigation in the U.S. Class A airspace using Area Navigation (RNAV) or long-range navigation systems (LRNS). This notice amends all B035 templates (i.e., operations specification (OpSpec) B035, management specification (MSpec) B035, and letter of authorization (LOA) B035) for operators conducting airplane operations under parts 91K, 121, 125 (including the LODA 125M operators), and 135. This is a mandatory change to B035.