HealthToxic Fumes on Board Planes: Whistleblowing KLM Pilot SpeaksBy Heathcliff Peters - November 10, 2017052 Share on Facebook Tweet on Twitter Former pilot Willem Felderhof is required to never talk about getting sick from toxic fumes on aircrafts. That requires KLM in a silent contract, which is now in hands of a Dutch television documentary programme. Let's reveal the secrets!Sorry! This part of content is hidden behind this box because it is for members only. Why not take this chance to become a member?