ACMI leases for TUI from (mostly ACMI specialist airlines) such as Olympus Wamos Hi-fly Titan Evelop ASL Jet-time Privilege Style & Euroatlantic etc etc etc will be ''aircraft crew maintenance and insurance''
ACMI, aka as a Wet lease. A Dry lease means that the aircraft is being provided without any flight crew - such as the Sunwing 737 leases to TUI.
A Damp Lease is defined as a Wet-leased aircraft that includes a cockpit crew but not a cabin crew.
So yes all the FD and CC are from the ACMI airline - occasionally the airline they are leasing to (TUI in this case) may put on board one or two of their own CC members as a pax courtesy, maybe for language issues.
At BMA when we ACMI leased and flew for EL AL with all our own CC.
But at Britannia we leased to and flew for Air France when their pilots were on strike, and an AF CC member or two came on the flights to speak French.