Thai Airways used to operate a flying gas can Airbus A340-500 non-stop from Bangkok to Los Angeles and also to New York JFK (May 2005 – June 2008). Both of those flights were eventually eliminated as uneconomical. Thai has also flown one-stop between Bangkok and Los Angeles, such as via Seoul and via Osaka.
But they no longer serve the U.S. at all, having suspended operations last fall as they worked to stem financial losses. And they aren’t allowed re-start service, either.