Equipment for the rescue mission to find the missing Titan submersible is being collected from Jersey.
A US Air Force plane landed the island shortly after 5am on Thursday (22 June).
Channel 103 understands a further two aircraft are coming to the island today.
The C17 Globemaster is in Jersey to collect a remotely operated vehicle (ROV) owned by Guernsey-registered deep water specialist company Magellan.
Credit: Maximilian Young Photography / Instagram: @maximilian.young
Reports earlier this week said it had been awaiting US approval to join the operation in the North Atlantic.
The missing submersible, Titan, which was taking passengers to visit the shipwreck of the Titanic, lost contact on Sunday morning with five people on board.
Oxygen supplies onboard are expected to run out at midday UK time.
Earlier this week Magellan issued a statement saying it is '100% focused on supporting the rescue mission to recover the submersible'.
"We have been working full-time with UK and US agencies to secure the necessary air support to move our specialist equipment and support crew. We are ready to support, and we are fully mobilised to help."