Data / Federal rules / 2025-22635
Establishment of United States Area Navigation Route T-581 in the Vicinity of Missoula, Montana
The Federal Aviation Administration published this proposed rule in the Federal Register on December 12, 2025. Comments closed on January 26, 2026.
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What the agency says
This action proposes to establish United States Area Navigation (RNAV) Route T-581 in the vicinity of Missoula, Montana. The FAA is proposing this action to increase navigational flexibility and safety margins for the users and to expand Air Traffic Control operational capabilities.
Key facts
- Document number
- 2025-22635
- Type
- Proposed rule
- Action
- Notice of proposed rulemaking (NPRM)
- Agency
- Transportation Department; Federal Aviation Administration
- Published
- December 12, 2025
- Comments due
- January 26, 2026
- Dates
- Comments must be received on or before January 26, 2026.
- Docket
- Docket No. FAA-2025-3288; Airspace Docket No. 25-ANM-158
- Regulation ID (RIN)
- 2120-AA66
- Code of Federal Regulations
- 14 CFR 71
- Topics
- Airspace; Incorporation by reference; Navigation (air)
- Pages
- 2
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Everything from the Federal Aviation Administration · Rules on airspace · Rules on incorporation by reference · Rules on navigation (air) · Published in December 2025
Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.