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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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Title 14
Chapter I
Part 38 - PART 38—AIRPLANE FUEL EFFICIENCY CERTIFICATION
Subpart A [§ 38.1 - § 38.9] - Subpart A—General
Subpart B [§ 38.11 - § 38.23] - Subpart B—Determining Fuel Efficiency for Subsonic Airplanes
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