I am flying from Lima to Buenos Aires with a stop over in Santiago, Chile - do I have to pay the 100
If you enter the country through customs yes. If it's only a stop (transit) then no. The reciprocal fee is only paid when you go through customs and enter the country, the booth where you pay it is just a few metres away from customs. If you're in transit you will be directed straight to your gate and not go through customs.
If you enter the country through customs yes. If it's only a stop (transit) then no. The reciprocal fee is only paid when you go through customs and enter the country, the booth where you pay it is just a few metres away from customs. If you're in transit you will be directed straight to your gate and not go through customs.

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