Professors and plan

[RevSmoke]

A group of professor were called and boarded a plane.
When the doors closed and the plane is about to take off, all the professors were informed that this plane was made by their students. All the professors rushed toward the plane doors, trying to escape and survive on their own with exception of one professor, he remained seated. He exuded confidence and calmness.
Someone's asked him, "Why are you not trying to escape the plane."
The professor answered him with confidence, "They are our students."
This was followed by the next question, "Are you sure that you taught them well?"
To which the professor replied quietly, "I'm sure it won't fly."

Peace of the Lord be with you.