Koepcke was about to graduate from high school. Her mother Maria had wanted to return to Panguana with her daughter on 19 or 20 December 1971, but Koepcke wished to attend her graduation ceremony on 23 December. Maria agreed for Koepcke to stay longer and instead they scheduled a flight on Christmas Eve. All flights were booked, aside from one with Líneas Aéreas Nacionales S.A. (LANSA). Her father Hans-Wilhelm urged his wife to avoid flying with the airline, which had a poor reputation. They booked the flight, nonetheless.