As used in this part:

(a) Energy efficiency means the ratio of the useful output of services in air transportation to the energy consumption of such services.

(b) Energy statement is a statement of the probable impact of a major regulatory action on energy efficiency and energy conservation, contained in a decision, opinion, order, or rule.

(c) Major regulatory action is any decision by the DOT decisionmaker or administrative law judge requiring an energy statement pursuant to § 313.4 of this part.

(d) NEPA means the National Environmental Policy Act of 1969.

(e) Statute means Subtitle VII of Title 49 of the United States Code (Transportation).