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18.05.2020Pereira flies the Embraer E, which has a performance function as part of its Flight Management System. Commercial aircraft depart airports through a standard procedure, where they are under positive control of ATC. These procedures instruct pilots when to make their turns in the direction of the destination and at what altitude they should expect.
It all depends. For flights across the Atlantic, routes are calculated by oceanic controllers in Gander, Newfoundland, and Prestwick, Scotland, twice per day. There, traffic flows depart Europe mostly in the late morning and afternoon, arriving in the US at a local time also in the late morning or afternoon thanks to the time zone difference. The planes then turn around and depart the US in the late afternoon and evening, arriving in Europe in the morning the next day.
Most of the planes are heading the same way, separated by five minutes in the air. Controllers and airlines make use of the winds aloft to benefit from a tailwind and minimize substantial headwinds, knowing that the powerful jetstream winds blow at altitude always west to east. Altitudes are chosen accordingly by the oceanic controllers.
In addition, airlines will want to maximize winds aloft and the performance efficiencies gained by flying at higher altitudes, where the air is thinner and opposes less resistance, meaning less fuel can be used. Disclaimer: The responses below are not provided or commissioned by the bank advertiser.
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Please view our advertising policy page for more information. Skip to content. Advertiser Disclosure. Mike Arnot. Why the difference? Image by the author. Flights Across The Atlantic The jetstream dictates what altitude controllers choose. Sign up for our daily newsletter. Sign up. Commercial or passenger aircraft are usually designed for optimum performance at their cruise speed V C.
Combustion engines have an optimum efficiency level for fuel consumption and power output. With aircraft, other factors affecting optimum cruise altitude include payload, center of gravity , air temperature, humidity, and speed. This altitude is usually where the higher ground speeds , the increase in aerodynamic drag power, and the decrease in engine thrust and efficiency at higher altitudes are balanced.
This aviation -related article is a stub. You can help Wikipedia by expanding it. From Wikipedia, the free encyclopedia. Retrieved Flight phases. Categories : Flight phases Aviation stubs.
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