This article deals
with the transaction costs in the passenger and cargo air transport sector for
United States and Brazilian airlines. After discussing transaction costs and
their importance, a comparative study is conducted on their relevance for companies
in these two countries. The study concludes that transaction costs for
Brazilian airlines are proportionally about five times higher than those for US
airlines. Finally, simulations are performed for the economic operating results
of airlines from both countries if their transaction costs were zero.