New York to Hanoi Vietnam $557 RT on Japan Airlines (travel Sept-Nov)

Japan Airlines, a OneWorld Alliance, has roundtrip airfares travelling from New York (JFK) to Hanoi Vietnam (HAN) for $557 including taxes and fees. This makes 1 stop in Tokyo.
Travel availability:
Departs JFK: Sep 5-7, 11-14, 18, 20-21, 25-28; Oct 3-4, 11-12, 16-17, 19, 23-26, 30-31; Nov 7-9, 14, 16, 21-23, 28
Returns JFK: wide availability returnning Mon, Tue, Wed, Thur beginning Sept 7 thru Dec 5
This is available to book on CheapOAir or Japan Airlines .