Many corporations allow ceos to use their firm's corporate jet for personal travel. the internal revenue service (irs) requires that the firm report personal use of its corporate jet as taxable executive income, and the securities and exchange commission (sec) requires that publicly traded corporations report the value of this benefit to shareholders. a firm may use any of three valuation techniques. the irs values a ceo's personal flight at or below the price of a first-class ticket. the sec values the flight at the "incremental" cost of the flight: the additional costs to the corporation of the flight. the third alternative is the market value of chartering an aircraft. of the three methods, the first-class ticket is least expensive and the chartered flight is most expensive. what factors (such as fuel) determine the marginal explicit cost to a corporation of an executive's personal flight? explicit costs to a corporation of an executive's personal flight include