It's now a few minutes past sunset over the area and major SAR activities will be winding down until tomorrow morning, 6am local time (23:00Z, 6pm EST).
National SAR has updated the aircraft's last known position as: 3°36'31.0"S 109°41'46.0"E. See
Google Maps.
The are gearing up for an initial search which may last up to one week, at which time they will re-assess the situation.
Air and sea assets from Malaysia and Singapore will also be arriving overnight to take part in the search starting tomorrow. Australia has also offered assistance.
Local fishermen are also helping to search, and a Susi Air aircraft chartered by one of the families.