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Paying in another currency isn't unethical; the airline is expressing a strong desire to avoid exchange expenses and risk by dealing in their home currency. I understand the FTC position that it's not an offering directed at US consumers, however.

Sometimes there may also be regional differences in assessed fees and when they are displayed (maybe the Chilean price shown at ticket selection includes a different checked bag allowance, or does not show any airport fees that would be shown at time of payment)