# Modification of Class B Airspace; Seattle, WA
> **Rule** · Final rule. · Published 2011-10-25 · Effective 2011-12-15 · 76 FR 65945
## Document
- **Document number:** 2011-27367
- **Category:** airspace
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 76 FR 65945
- **Publication date:** 2011-10-25
- **Effective date:** 2011-12-15
## Abstract

This action modifies Seattle, WA Class B airspace to ensure the containment of large turbine-powered aircraft operating to and from the Seattle-Tacoma International Airport. The FAA is taking this action to enhance safety, improve the flow of air traffic, and reduce the potential for midair collision in the Seattle, WA terminal area.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2011/10/25/2011-27367/modification-of-class-b-airspace-seattle-wa)
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