Ground testing of engines with ash contaminants needs to be done, followed by air testing. I am not willing to be flying into unknown risk with or without passengers in a scenario that is going to affect all my engines, and I'm horrified at the arrogance and cavalier attitude of those who think this is all nothing and that we should get back in the air without proper scientific and engineering analysis. You bang on about your professionalism while showing anything but that, meanwhile you refuse to listen to experts in vulcanology, meteorolgy and engineering and refuse to believe the evidence of the several military aircaft affected in lod density ash areas.
Best post on the subject IMHO.