; and (ii) meets either an industry consensus standard or other standard that facilitates the safe use, production, and distribution of such unleaded aviation gasoline. . 620A. GAO study on fee transparency by fixed based operators (a) In general The Comptroller General shall conduct a study reviewing the efforts of fixed based operators (in this section referred to as FBOs ) to meet their commitments to improve the online transparency of prices and fees for all aircraft and enhancing the customer experience for general and business aviation users. (b) Contents In conducting the study described in subsection (a), the Comptroller General, at a minimum, should evaluate the FBO industry commitment to Know Before You Go best business practices including— (1) FBO provisions for all general aviation and business aircraft types regarding a description of available services and a listing of applicable retail fuel prices, fees, and charges; (2) the accessibility of these fees and charges to aircraft operators on-line and in a user-friendly manner and with sufficient clarity that a pilot operating a particular aircraft type can determine what will be charged; (3) efforts by FBOs to invite and encourage customers to contact them so that operators can ask questions, know their options, and make informed decisions