Section 151.111 - Advance planning proposals: General(a) Each advance planning and engineering proposal must relate to an airport layout plan or plans and specifications for the development of a new airport, or the further development of an existing airport. Each proposal must relate to a specific airport, either existing or planned, and may not be for general area planning.(b) Each proposal for the development or further development of an airport must have as its objective either the development of an airport layout plan, under § 151.5(a) , or the development of plans designed to lead to a project application, under §§ 151.21(c) and 151.27 , or both.(c) Each proposal must relate to planning and engineering for an airport that-(1) Is in a location shown on the National Airport Plan; and(2) Is not served by scheduled air carrier service and located in a large or medium hub, as identified in the current edition of "Airport Activity Statistics of Certificated Route Air Carriers" (published jointly by FAA and the Civil Aeronautics Board), that is available for inspection at any FAA Area or Regional Office, or for sale by the Superintendent of Documents, Government Printing Office, Washington, D.C. 20402.(d) Each proposal must relate to future airport development projects eligible under subparts B and C.Doc. No. 6227, 30 FR 8040, June 23, 1965, as amended by Amdt. 151-24, 33 FR 12545, Sept. 5, 1968 49 U.S.C. 1115 ; sec. 308 , 72 Stat. 750, 49 U.S.C. 1349