Are there *plausible* planetary conditions where jet aircraft just don't have much advantage over propeller-driven aircraft?
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I've seen Which is easier to develop: a piston prop engine or a jet engine? and my own Effects of ~10atm pressure on engine design neither of which answers this.
Would different atmospheric density, composition, etc. ever be able to achieve this? Are there conditions under which no practical aircraft could reach the speed at which jets are a significant advantage in the first place?
PS. And not conditions where rockets have an advantage over both.
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