MR. CHIEF JUSTICE WARREN delivered the opinion of the Court.
This case concerns the power of the Civil Aeronautics Board to alter a certificate of public convenience and necessity, granted to respondent Delta Air Lines, after that certificate had become effective under § 401 (f) of the Federal Aviation Act of 1958. 72 Stat. 731, 755, 49 U. S. C. § 1371 (f).
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