Pace when you think how much air gets sucked into a jet engine every second and then look out how big the turbine blades are and how little of the contaminate is required to severely reduce there efficiency. Never mind the fact that minute quantities are required to block the cooling holes that run through them which if block means the blades over heat and burn up.
Actually its rather a lot.
I am very happy that the choice about flying has been given to professional engineers and out of the hands of airlines and pilots.
As this thread has showed pilots are pretty clueless about the risks involved. And the goat blowers in commercial have even less than the pilots.