It occurred to me one day that if you screw up the checklist, the chances are that you screwed up something before the checklist, but less likely the other way around.
Anyway, I see a few posts referring to a new fangled single pilot ops using checklists in flight. I've never heard nor seen of such a thing. Read and do checks on the ground and 100% memory from line up to turn off. I haven't heard of anybody doing it differently
