I don’t think that we appreciated the risk of the dust building up on the stators and rotors and effecting engine performance let alone sand blasting the airframe. I was on the DC10 when the KLM incident happened and operating through ANC often. Our lot decided it was too dangerous but the crews stuck there when we changed the routing to Tokyo via Bombay were flown to the lower 48 on the local operator who obviously thought it was a risk worth taking.