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4 votes
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Is the ISA still up to date?

Yes, it is up to date in the de jure sense that no updates were formally accepted. There are separate models for 'hot' and 'cold' days (and other conditions), but they have limited use. There are ...
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1 vote

Does a plane's service ceiling vary with season/temperature?

Does a plane's service ceiling vary with season/temperature? An airplane's Service Ceiling is generally defined as the maximum altitude above mean sea level (MSL) that can be reached at the point it'...
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2 votes

Does a plane's service ceiling vary with season/temperature?

The published performance data is based on the International Standard Atmosphere, being 15°C and 1013 hPa at sea level and decreasing at a standard lapse rate with altitude until you're in the ...
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1 vote

Does a plane's service ceiling vary with season/temperature?

There are a few misconceptions in this question that we need to address before it can actually be answered. While there is a very slight seasonal variation in the average sea-level atmospheric ...
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5 votes
Accepted

What was the reason for my flight’s low cruise altitude?

This is typical for short hops. High cruise altitudes are good for fuel efficiency and to get a higher speed over the ground. However, it takes a lot of fuel to get to 30,000ft and it may take more ...
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