The Denver airport trespasser who was dismembered by a jet engine after he calmly stepped in front of a Frontier flight had a dark criminal past, The Post can reveal. Michael Mott, 41, racked up over 20 arrests in Colorado dating back to 2002 — including for attempted murder. snip Starting when he was just 17, Mott was repeatedly arrested for minor infractions like shoplifting and underage alcohol consumption – but within just a couple of years, he had devolved into a hardened, violent criminal, his public rap sheet shows. By February 2005, he was arrested by officers from the...