RC-135S Cobra Ball 61-2662. Call sign DRAGO04. From Japan headed southwest toward Taiwan.
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The RC-135S Cobra Ball is a rapidly deployable aircraft which flies Joint Chiefs of Staff-directed missions of national priority to collect optical and electronic data on ballistic targets
The RC-135S, equipped with a sophisticated array of optical and electronic sensors, recording media, and communications equipment, is a national asset uniquely suited to provide America's leaders and defense community with vital information that cannot be obtained by any other source.
One wing and two engines in that wing are painted black to assist the cameras and sensors collecting data.
https://www.flickr.com/photos/125118100@N04/47158476651/