inspections, the mechanics look very closely at the skin. where these cracks have developed are in the lap joint. these are subsurface microscopic cracks where you need have a more comprehensive program such as ultrasound or x-ray. that wasn't required in this lap joint. so the inspection was fulfilled, however we're now fining out that these failure modes, these stress cracks were in an area that weren't preplanned or pre-identified by the manufacturer so the inspection program didn't need to be that comprehensive up until now. >> let's talk about teenage of this plane. we know it's 15 years old and because southwest flies a high volume of short flights really a business model that is coveted by other air agencies it's experienced around 39,000 takeoff and landing cycles. while the coveted business model of what southwest is doing financially might be something