That's probably less of an efficiency concern, but more likely to avoid future legal cost for supplying contaminated air to the cabin. https://en.m.wikipedia.o

That's probably less of an efficiency concern, but more likely to avoid future legal cost for supplying contaminated air to the cabin. https://en.m.wikipedia.org/wiki/Aerotoxic_syndrome https://en.m.wikipedia.org/wiki/Aerotoxic_syndrome