Life for a SoCal adolescent upends when his family moves to 1970’s Tehran, addled by homesickness, culture shock and coming of age, the unlikely adoption of an eagle inspires his escape into the ancient art of falconry.

In looking at this again, is it more of a "Pet Love" story? (Dolphin Tale, Free Willy, etc.) If yes, then the eagle does belong in the logline.

Is there a guy or girl friend involved? Or a father or mother figure?

This is a good step forward.

I hear what the others are saying, but this sounds character-driven like many a coming-of-age tale. Not that it matters for the logline, but I can imagine a tangible objective with the eagle developing in the second half (a competition or personal challenge or similar). If it is something major, it may help the logline...depends what you have in mind.

Cut fat and assumed parts to sharpen the rest. For example:

In (1971), after his family uproots him to Tehran, a SoCal (fifteen year-old) unable to make new friends escapes into the ancient art of falconry.

The new version omits everything about the ex-pat community and Americanization of Tehran. Is that an accurate reflection of these elements not being central to the story?