# Establishment of United States Area Navigation Route T-581 in the Vicinity of Missoula, Montana
> **Rule** · Final rule; correction. · Published 2026-09-18 · Effective 2026-10-29 · 91 FR 59055
## Document
- **Document number:** 2026-19173
- **Category:** other
- **Type:** Rule
- **Action:** Final rule; correction.
- **Citation:** 91 FR 59055
- **Publication date:** 2026-09-18
- **Effective date:** 2026-10-29
- **FAA docket:** Docket No. FAA-2025-3288
## Abstract

This action corrects a final rule published by the FAA in the Federal Register on August 3, 2026, establishing United States Area Navigation (RNAV) Route T-581 in the vicinity of Missoula, Montana. Specifically, this action corrects the description of the route in the regulatory text of the final rule.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/09/18/2026-19173/establishment-of-united-states-area-navigation-route-t-581-in-the-vicinity-of-missoula-montana)
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