Just to be on the safe side I have today purchased a bus ticket from Santiago de Chile to Mendoza (Argentina). In order to show the airline (in my case Condor) at the check-in desk in Munich how I will get out of the country after immigration, because I bought a one-way-ticket to Chile. It is nothing Chile’s immigration desk wants to see but only the airline.
I hope this will be sufficient and will convince them.
Costs for the ticket: $ 41,53
Cancellation possible until: 72 hrs before departure
Costs for cancellation: 15% of ticket price = $ 6,23 ( < € 6,-)