What about the Finnish reports of F-16s requiring complete engine overhauls after having flown through these clouds? I’m sure someone can put up the pictures here.
Good point. I was stationed at Subic Bay when Mt Pinatubo blew almost 20 years ago. IIRC, it was weeks before jets were allowed to operate into and out of Subic NAS precisely because of the danger of the ash cloud that lingered at altitude for a long time.