B D Finch Dec 28, 2015:

@Yasutomo I hadn't checked your link. Have now looked it up in Collins, which has "aerie" and "aery" as "variant spelling[s] of eyrie, especially US". I hadn't previously come across those spellings, however the listing as "variant" does mean Collins considers them less usual or recognised, at least for EN-UK.

Yasutomo Kanazawa Dec 28, 2015:

@BD Did you see the first link I posted?
Both spellings are correct.

B D Finch Dec 28, 2015:

Eyrie "Aerie" looks like a misspelling.