stress fractures

AP

Boeing says it’s providing technical assistance to federal aviation regulators and to Southwest Airlines in the wake of Friday’s mid-flight incident where a hole appeared in the skin of a 737 airliner at 34,000 feet.

The Seattle Times reports that the sudden rupture has experts concerned because the stress-related failure of the aircraft’s aluminum skin occurred mid-fuselage. That's a place that was not previously thought to be vulnerable to that kind of damage.