Post 9/11 hysteria turned commerical airline travel into at best an indignity and at it's worst a false belief it is any safer. This includes terrorist action and the chance accident. Cordage is even subject to confiscation. The rational action is to A. Take every precaution to survive a crash ; sitting over the wing at an emergency exit, woolen clothing, avoiding alcohol, and B. Learning skills to fabricate tools from native materials; lithic,bone or bamboo knives, friction firemaking etc. We too easily forget being " stranded in the Amazon" is in reality no worse than a South American Indian finding him/herself standing on 5th Avenue in New York. People live quite nicely in both places in spite of different conditions.