 In early 2002, David L. Gunn replaced Warrington as president.In a departure from his predecessors' promises to make Amtrak self-sufficient in the short term, Gunn argued that no form of passenger transportation in the United States is self-sufficient as the economy is currently structured.Highways, airports, and air traffic control "all" require large government expenditures to build and operate, coming from the Highway Trust Fund and Aviation Trust Fund paid for by user fees, highway fuel and road taxes, and, in the case of the General Fund, from general taxation.