The company is profiting on demand for school buses.Blue Bird (BLBD 27.68%) is making more money selling school buses than expected, and investors are taking notice. Shares of the transportation company surged 26% Thursday after a strong earnings report.Blue Bird gets an A+Blue Bird is a nearly 100-year-old maker of school buses with more than 20,000 vehicles currently on the road.The company earned $0.89 per share in its fiscal second quarter ending March 30 on revenue of $345.9 million, easily topping Wal ...