According to the US State Department website (emphasis mine):
A Tourist Card will be issued for a stay of up to 90 days upon payment of a reciprocity fee, currently US $160. Currently, the fee is only charged at the Santiago International Airport. Payment can be made in U.S. currency or by credit card.
Does this mean that if I were to enter Chile via other means (e.g., a different airport or via overland travel) that I would not be required to pay the reciprocity fee? Or would I be required to make arrangements to pay the fee before I arrived?