Registration is N559DW but callsign most used is simply 9DW read as "niner delta whisky"

See http://alderspace.pbworks.com/w/file/143905872/_Doug%20White_%20_King%20Air_%20-%20Google%20Search.pdf for more of these. Those are just the first few.

And note even those in the PDF are still just the first few! There are more than ten thousand ghits, covering ten (web) pages of which the PDF is just the first, and all of the first few ghits seem relevant.

See more on the talk page.

https://www.thewrap.com/dennis-quaid-on-a-wing-and-a-prayer-mgm-hero-passenger-landed-plane/

https://edition.cnn.com/2010/TRAVEL/03/29/couwels.emergency.landing/index.html

https://www.flyingmag.com/news/low-time-single-engine-pilot-saves-king-air-and-his-family/ mentions the registration (long callsign)

edit

Not sorted and maybe some duplicates of the above