I can’t write plural in the Forum, for example Aircraft-s, the ‘‘s’’ is getting automatically deleted as soon as I write it together.
It’s really annoying and I can’t figure out if this is a Forum bug or if I’m doing something wrong.
Aircraft Aircraft
aircraft
Looks to be a forum bug, seeing the same. If you edit you can see the S on the end
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ok thank you, so this is an autocorrection feature?
And my english is just bad 
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Was this feature implemented after the famous “Aircraft with an S” appeared on a startup splash screen after an update? 
Just curious as to whether the possessive “s” would work. Let’s try: the aircraft’s tail fell off.
That seems to work.
Edit: what about the plural possessive? These aircraft’ tails.
That doesnt work.
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The plural possessive of aircraft is aircraft’s. That’s because aircraft is already plural.
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Ah you spotted my deliberate mitsake!
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“Turbulences” is another one that will autocorrect. (I disabled it temporarily to write this.)
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Yes but if it’s a collection of different types of turbulence the ‘s’ is appropriate.
Ingerlisch ain’t easy innit.
I don’t know if there are any cases of it being used in that way in the forums, but there are many cases of it being used the other way.
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By the way, your English is great! I wish I spoke German as well as you speak English.
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Similarly, aircraft-with-an-s is a perfectly valid way to refer to a collection of different types of aircraft. In fact, most mass nouns can be used in this way, if it is contextually correct.