[Mike Mercury]

The sole survivor was 17-year-old Juliane Koepcke, who while strapped to her seat fell 3,000 m (9,843 ft) into the Amazon rainforest. She survived the fall and was then able to walk through the jungle for 11 days until being rescued by local fishermen. The Electra was LANSA's last aircraft; the company lost its operating permit 11 days later.

In Koepcke’s case, experts credit the fact that she was harnessed into her plane seat during her descent for her survival, though not without breaking her collarbone.

Belted into her seat she was somewhat shielded and cushioned, but the outer seats of the row — those on each side of Koepcke, which remained attached to hers as part of a row of three — are thought to have functioned as a parachute and slowed her fall. The impact may have been lessened further by a thunderstorm updraft and the thick foliage at her landing site. As many as 14 other passengers were also later found to have survived the initial crash, but died awaiting rescue

https://en.wikipedia.org/wiki/LANSA_Flight_508