49 CFR § 604.21 - Special considerations for advisory opinions.

---
identifier: "/us/cfr/t49/s604.21"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 604.21 - Special considerations for advisory opinions."
title_number: 49
title_name: "Transportation"
section_number: "604.21"
section_name: "Special considerations for advisory opinions."
chapter_name: "FEDERAL TRANSIT ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
part_number: "604"
part_name: "CHARTER SERVICE"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 5323(d); 49 CFR 1.91."
regulatory_source: "73 FR 2345, Jan. 14, 2008, as amended at 90 FR 28213, July 1, 2025, unless otherwise noted."
cfr_part: "604"
---


# 604.21 Special considerations for advisory opinions.

Based on new facts involving significant financial considerations, the Chief Counsel may take appropriate enforcement action contrary to an advisory opinion before amending or revoking the opinion. This action shall be taken only with the approval of the Administrator.