; and (2) submit to the appropriate committees of Congress and the National Academies Space Studies Board, for its consideration during formulation of upcoming decadal surveys, a report on the study. (b) Contents The study shall include the projected cost of such activities, including the cost of extended operations for refurbished science missions. 308. Earth science (a) Sense of Congress It is the sense of Congress that NASA’s Earth Science Division plays an important role in national efforts to collect and use Earth observations in service to society and to understand global change. (b) Earth Science Program The Administrator shall, to the extent practicable, follow the recommendations and guidance provided by the scientific community through the National Academies of Sciences, Engineering, and Medicine decadal survey for Earth Science, including the following: (1) The science priorities established by the decadal survey. (2) The execution of the series of existing or previously planned observations, known as the program of record. (3) The development of cost-capped medium- and large-size missions. (4) Opportunities for a mid-size principal investigator-led, competitively selected explorer class missions. (5) The development of the Venture-continuity class of small satellite missions in order to provide opportunity for low-cost sustained observations. IV Aeronautics 401. Short title This title may be cited as the Aeronautics Innovation Act . 402. Definitions In this title: (1) Aeronautics Strategic Implementation Plan The term Aeronautics Strategic Implementation Plan means the Aeronautics Strategic Implementation Plan issued by the NASA Aeronautics Research Mission Directorate. (2) Unmanned aircraft system; unmanned aircraft The terms unmanned aircraft system and unmanned aircraft have the meanings given those terms in section 44801 of title 49, United States Code. (3) X-plane The term X-plane means an experimental aircraft that— (A) is used to test and evaluate a new technology or aerodynamic concept