The 63,000 spectators crowded in late January inside Atlanta’s Georgia Dome for a battle of college marching bands didn’t know they’d also be schooled in auto safety. Between the Lincoln University Orange Crush Roaring Lions and the Bethune Cookman Marching Wildcats, event sponsor Honda Motor Co. flashed an alert on the stadium scoreboards. It listed 11 Honda and Acura models that need to have airbags replaced because they can malfunction and spray potentially lethal shards of metal into the vehicle.