High Hopes

Today in Fluid Mechanics, I learned that when modeling a blimp in a wind tunnel we can ignore the effects of air compression due to the flow...or so I thought. The professor said we can ignore these effects, "unless we have a supersonic blimp." Now, I know he was the one who thought of it, but I think I have a real investment potential here. Our country wants a fast and stylish way to get around the air, and let's face it, airplanes are so pre-9/11. What is more badass than breaking the speed of sound in giant advertisement, I mean, what's the worst that could happen in attaching several jet engines to a blimp?