The engines of “Miss Piggy” were silent Wednesday morning, the massive four-bladed propellers standing still like giant crosses against the humid sky. Nick Underwood stood in the shadow of the wing, his voice carrying easily in the quiet of the Chennault International Airport tarmac as he addressed the group of Laccasine High School seventh-graders. “I have been flying into hurricanes for about the last 10 years,” the aerospace engineer told the…