Carbon monoxide and other left overs from combustion. However, the trail you see behind a plane flying high up is called the contrail, and it consists of water vapor that freezes behind the plane.
You are not allowed to smoke ANYTHING on an airplane.
The smoke is actually ice that freezes in the air
Contrails
It's not smoke, it's steam. When the water in the air passes through the airplane's engines, it warms up and becomes steam.
The airplane was made in 1343
Contrails or condensation trails
That is an airplane equipped with a smoke generator. The pilot maneuvers the plane to form letters and symbols with the smoke trail.
Yes, i did it 2 weeks ago.
Leonardo da Vinci made the first paper airplane
The two wings of the airplane are made of aluminum.
it was made on purpose
The first airplane was made on December 17, 1903. It was made and flown by the Wright Brothers. It was flown at Kitty Hawk.