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The phrase "air castle" is correct and usable in written English.
It is typically used to refer to an unrealistic or fanciful idea or dream, often one that is unlikely to be realized.
Example: "She spent her afternoons building air castles, dreaming of a life filled with adventure and excitement."
Alternatives: "pipe dream" or "fantasy world".
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Air Max was like the Air Jordan's cousin.
Even on air, Letterman was a flirt.
Punch the air, Judd Nelson!
NOTES FROM THE AIR: Selected Later Poems, by John Ashbery.
It's like fresh air," Ewing said.
"Change is in the air," Mr. Carpenter said.
"Just chuck it up into the air," Thompson called out.
"I have felt my body melt into air," Beth says.
"And I shot it into the air," Sadiq said.
"It was in the air," Eileen said of the ritual.
In the air, Ryan Tannehill struggled with ball location.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com