It has more to do with the air conditions than the planes.
All planes give off exhaust from their engines. This contains carbon dioxide and monoxide, some nitrogen oxides and lots of water.
The water is emitted as a gas (steam) that under the right cold and humidity conditions condenses into tiny water droplets and these very quickly freeze into very fine ice.
These conditions are found more commonly in the upper atmosphere, so high flying planes tend to leave contrails (condensation trails)
Low flying planes emit the same exhaust, but in the warmer air at lower altitudes the water content does not turn to water and ice droplets - it remains as an invisible gas.
it can fly
two planes intersect in one line, or the planes could be parallel. by the way there is no such thing as skew planes...
The angle between two planes when the planes intersect at a point is the acute angle fixed by the normal vectors of the planes.
9 planes in Cube 3 Planes in Cuboid
parallel planes
Planes can fly in some snow storms but others will cause cancellations.
So planes are more visible at the airports at night.
It depends if you mean private planes or commercial or passenger planes. For passenger planes I think Air Canada would probably buy planes though I am not sure and I am sure there would be others.
Some know how to fly planes because they are finished training but others have to go to flight school because they are new. Lots of pilots know how fly planes but others will learn how to fly.
for flying really, but they also can do the different tasks they are built to do(exp. a passenger planes carries people to a certain destination,a bomber planes drops bombs on a certain target etc.)
please never cheat others
Airplanes are very important. We use them for attack, bomber, and fighter aircraft. They also help the military see what the enemy's territory looks like using reconnaissance planes. They help locate the enemy and direct the military to it. Some are used to patrol certain areas. Others help forecast the weather. There are planes that help rescue people, called search and rescue aircraft. And there are some airplanes that even refuel other planes in mid-flight! There are also civilian planes. These planes carry passengers and cargo across the world. Others are just to fly for fun, and trust me, it is fun!
it affected it by the oponents in the war being able to see what the others are doing using planes
The tendency of some minerals to break along certain planes is called, "Cleavage".
The strong tendency of certain minerals to break along smooth parallel planes is known as cleavage. Cleavage occurs due to the internal atomic arrangement of the mineral, which allows it to break along specific planes of weakness.
to make it visible to small planes and helicopters.. and even some time immigrating birds
There are huge areas of frozen methane gas on the seafloor in the Triangle. When the solids heat and become gaseous this results in a change in the density and composition of the air above. Objects such as boats and planes lose their buoyancy and sink due to the change in the atmopshere.