Planes fly at high altitudes, often around 10 kilometers (33,000 feet), primarily to take advantage of thinner air, which reduces drag and increases fuel efficiency. Additionally, flying at higher altitudes allows aircraft to avoid most weather disturbances and turbulence, providing a smoother ride. The reduced air pressure at these heights also enables jet engines to operate more efficiently. Lastly, higher altitudes enhance safety by providing more time for response in emergencies.
If you are looking for the answer to a crossword then think in terms of raising the birds from the gound. Your answer will be beater.
I think it's just the order the objects are thought of when guessing at what "that object in the sky" is. Planes are often named after objects other than birds. Cherokee's, Cessna's, Mooney's and Lear all all examples of planes not named after birds.
we think they are 119 planes in the hold wide world
There were three planes so the Japanese did not think more than the planes were just weather planes. They were mistaken.
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.
I think its there to warn planes of the hill
i think 4
I think the 9/11 planes were Boeing 767s. im not sure. they were big but!
I think it is only 3
I think some are allowed.
I think if there in a cage there allowed
i think it cna it makes more people come on planes and that damages the environment i think it cna it makes more people come on planes and that damages the environment