That's pretty wild for the Boing 737s, I wonder if Alaska Air technicians just glossed over the pre-flight checks or if the plane in question had any maintenance or deferred maintenance that wasn't addressed.
From my perspective, pinnacle incident events are usually, a combination of inefficient practices, behavior, lack of knowledge or experience and a whole slew of things.
For example, a company can put a fresh new tech to do maintenance, but a lot of things get missed because the new guy isn't sure of what defects to look for.
I wonder what the investigation details will be, when they give the public some kind of statement.