Kathleen DeSisto has a good job, a house, four kids and, as she affectionately puts it, “a man-child” at home, a husband who is also gainfully employed as a manager at a club in downtown Boston.  But she’s uneasy.

That’s because she sees a way of life disappearing, one that rewards skilled blue collar workers like her with good careers and a comfortable retirement. General Electric Co. has provided her family members and residents of Massachusetts’ North Shore with that kind of employment for generations at a massive plant that manufactures aircraft engines. But in the last several decades,