Guys,
I am not a helo pilot but I do train pax and aircrew in HUET and general aviation safety.
Could someone please clarify the following for me:
In other areas of the world where I have worked in the oil and gas industry, flights at night are generally undertaken only for urgent medivac. Are night transfer flights the norm in GOM or is it the requirment to land and depart the platform / vessell during daylight hours and the flight may then be completed at night?
Very sad whatever the cause

and it makes my job that little bit harder when I have to convince inexperienced flyers about the safety and reliability of overwater helicopter flights.
My sincere condolences to all involved and affected by this tragedy.