Physical Danger
In addition to designing aircraft, you might be supervising the construction of these things, and anything that uses jet propulsion to get going can be more than a little bit dangerous. It's not like aerospace engineers are being routinely blasted out of assembly hangars, however, so don't worry about it that much.
To be on the safe side, though, don't say anything that might directly provoke or enrage any of your creations. Remember what happened to Dr. Frankenstein. He got just a little too cocky.