# 2026-15675: New T-581 Route over Montana Skies for Pilot Safety Boost

2026-15675, Establishment of United States Area Navigation Route T-581 in the Vicinity of Missoula, Montana, is a Federal Register rule from Transportation Department, Federal Aviation Administration published 2026-08-03, effective 2026-10-29 (as of 2026-08-10).

- Canonical: https://policyrisk.com/federal-register/2026-15675
- As of: 2026-08-10
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-15675
- Title: Establishment of United States Area Navigation Route T-581 in the Vicinity of Missoula, Montana
- Type: Rule
- Agencies: Transportation Department; Federal Aviation Administration
- Citation: 91 FR 48756
- Published: 2026-08-03
- Effective: 2026-10-29
- Comments close: not stated
- Significant: no
- Touches household money: no
- Regulation identifier numbers: 2120-AA66
- Last updated: 2026-08-10

## In one line

New T-581 Route over Montana Skies for Pilot Safety Boost

## Summary

The FAA is creating a new flight path called Route T-581 near Missoula, Montana, to make flying safer and more flexible for pilots and air traffic controllers. This new route starts on October 29, 2026, and helps improve how planes navigate the skies without costing extra money. Pilots flying in this area will benefit from smoother and safer trips thanks to this update.

## Abstract

This action establishes United States Area Navigation (RNAV) Route T-581 in the vicinity of Missoula, Montana. The FAA is taking this action to increase navigational flexibility and safety margins for the users and to expand Air Traffic Control operational capabilities.

## Effects PRIA read

- New RNAV Route T‑581 Near Missoula: benefit, low. You (pilots and air traffic operators in the area) will have a new RNAV route called T-581 between Missoula (MSO) and Kalispell (FCA). It becomes effective at 0901 UTC on October 29, 2026, and the FAA says it increases navigational flexibility and safety margins and expands Air Traffic Control oper…

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## Sources
- [2026-15675 on federalregister.gov](https://www.federalregister.gov/documents/2026/08/03/2026-15675/establishment-of-united-states-area-navigation-route-t-581-in-the-vicinity-of-missoula-montana)
- [2026-15675 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-08-03/pdf/2026-15675.pdf)

## Related
- [Previous: 2026-15666, Reduction in Force Appeals](https://policyrisk.com/federal-register/2026-15666)
- [Next: 2026-15680, Amendment of Very High Frequency Omnidirectional Range Federal Airways V-108 in…](https://policyrisk.com/federal-register/2026-15680)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2026-15675 (as of 2026-08-10).