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Because they're flying at different altitudes.
The condensation trail formations can be predicted by FAA weather shops based on expected humidity levels in different levels of the atmosphere - so a plane that's flying at say Flight Level 330 (roughly 33,000 ft, but not exactly-that's another question) may not be creating contrails; but one flying at FL380 is. Primarily due to the different levels of moisture in the air.
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What are jet contrails?
Jet contrails are water condensation resulting from the rapid compression and decompression of the air around the wing as the airplane moves through the atmosphere. The atmospheric conditions have to be just right for contrails to occur, and that is why you sometimes see contrails seem to wink off and on, as the airplane passes through drier air the contrails will stop.
How did tanks and planes affect the outcome of ww1?
it affected it by the oponents in the war being able to see what the others are doing using planes
Can we see contrail in all aircrafts?
Not all the time BUT All aircraft can make Contrails that we can see. The weather conditions have to be just right.
What is an importance of airplane?
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!
Why does some plane leave a smoke trail and some don't?
If you are asking about contrails it is dependent on the temperatures aloft. At colder temperatures the water vapor in the exhaust condenses and causes the contrails you see. The blue angels and other aerobatic-performance aircraft inject a special oil "smoke oil" into their exhaust in order to leave the smoke trail you see at airshows. But the "smoke trail" you see behind civilian and commercial aircraft isn't smoke at all, it is water vapor formed as described above.
Why do planes leave white lines in sky?
What you see is not smoke- they are contrails- short for condensation trails. The air is extremely cold at that altitude, the exhaust is hot, and contains a great deal of water vapor. When it comes in contact with the cold air, it condenses, and becomes visible, like fog or clouds. Ever see the "steam" roll out of the bathroom after a hot shower? Same idea.
When you see contrails from a jet at 40000 feet do you ever hear the sound of that jet on the ground?
No. You would hear the jet as it passes over, but since light travels faster than sound you will have to look ahead of where you think the sound is coming from in order to see a jet. But if the contrails are already there, the jet would have come and gone already.
What are some jobs for pilots?
A pilot is responsible for flying planes and keeping passengers safe. They may fly commercial passenger planes or cargo planes.
What did the planes in World War 2 look like?
See the related link for some great pictures -
Did Americans have airplanes in World War 2?
The Americans had hundreds of thousands of airplanes in both the Pacific and Europe. See the link below. There is a list of aircraft. Click on the planes and you can see what they looked like. There are museums around the world which have some of the planes from WW2. See if there is one near you.
When you see a jet contrail should you hear its sound coming from a spot on its contrail where it was 40 seconds ago?
contrails are water molecules at high altitude due to condensation.
What helps planes see in the fog?
Radar
