TUI has finalised an order for 10 Boeing 737 Max 8s and one 787-9.
The leisure group now has unfilled orders for three 787-9s and 70 Max jets, says Boeing.
Flight Fleets Analyzer shows that TUI subsidiary Thomson Airways has nine 787-8s and one 787-9 already in service.
As part of the deal disclosed at the Farnborough air show, TUI has also taken an option on an additional Dreamliner of the same variant.
Additionally, the group has signed up to Boeing's GoldCare Component Services programme for its 737NG and Max narrowbodies.
TUI will, notes Boeing, be the launch customer for 737 Max Component Services.
Thomson and another TUI subsidiary, Jetairfly, have had their 737NGs enrolled in the component services programme since September 2007.
Thomson and Jetairfly are joined in TUI Group by Corsair, TUIfly, TUIfly Netherlands and TUIfly Nordic.