You did not provide a photo showing the button's back, which is often highly important for correctly identifying it. But, in the one photo you posted, there appears to be rust-crust peeking out from the back along the button's edge. If it does have an iron/steel back, that means it is a cheap "Fashion" button, made for use on civilian coats and jackets, with a fancy-looking emblem to make the coat/jacket look more expensive than simple plain buttons would.
Besides an iron back, other characteristics indicating a civilian "Fashion" button are the cheap weak detail in the coronet (which is not a Royal Crown), and the stippled background around the emblem.
All of that having been said... I think there IS a foreign Coat-of-Arms (or Airline logo) which shows a six-point star above a set of disembodied wings on a shield. Can't recall which country though. Might be Central or South American. My computer died, so I am currently unable to search through my image folder of Foreign-button photos.