American Samoa's Congressman, Faleomavaega Eni Hunkin, has written to Hawaiian Airlines asking for an explanation for its substantial fare increases.
Faleomavaega says the fare hikes were completely unanticipated, and gave travel agents and travellers in American Samoa little time to prepare for the transition.
He said prices had gone up by around 26 per cent for a flight between American Samoa and Hawaii but left fares for other routes unchanged.
Faleomavaega said the new schedule meant Hawaiian Airlines prices were now substantially higher than comparable routes between Apia and Honolulu.
A spokesman for Hawaii Airlines, Keoni Wagner, said the higher operating costs for the Pago Pago route has resulted in the increases.
Hawaiian Airlines is the only commercial passenger airline operating in American Samoa.