IFR Altitudes; Miscellaneous Amendments

What it does

• •Amends minimum and maximum en-route authorized instrument flight rule (IFR) altitudes for specific federal airways, jet routes, and direct routes in the National Airspace System.
• •Modifies changeover points (COPs) that establish navigation aid coverage boundaries for safe IFR operations.
• •Updates altitude requirements for multiple RNAV (area navigation) routes, primarily in Alaska and the northwestern United States, with changes effective October 29, 2026.

Why it matters

• •Ensures safe and efficient aircraft navigation under instrument conditions by maintaining adequate navigation aid coverage and preventing frequency interference on established flight routes.
• •Reflects changes in the National Airspace System and coordinates with published aeronautical charts essential for pilot operations.
• •Issued as an immediately effective final rule based on a finding that notice-and-comment procedures are impracticable due to the need for timely safety-related adjustments to flight information.

Who is affected

• •Aircraft operators flying under instrument flight rules on specified federal airways, jet routes, and direct routes, particularly in Alaska, Montana, Nebraska, and Rhode Island.
• •Pilots and flight crews who use the affected RNAV routes and must comply with updated minimum and maximum altitude requirements.

What happens next

The amendment becomes effective at 0901 UTC on October 29, 2026, as established in this final rule.