It is interesting. News reports state that Westwind reported the accident to the Coast Guard at 6:35 local time. Sunset in the Gulf of Mexico on the day of the accident was about 6:22. Most operators require single-engine ships to be at their offshore destination or at least over "the beach" by 30 minutes prior to sunset (what we call "downtime"). The reason for downtime is so that if anything happens, there is half a chance of launching a SAR aircraft before it gets too dark. So this raises some questions. What time did this event occur? Was there a delay in discovering and reporting it? Was he out flying around past downtime? Does Westwind use any kind of aircraft-based flight-following software? It seems odd that a single-engine ship was out flying around in the GoM that close to sunset.