TUIfly equipped these two 737 with 54 First Class seats for 2008 Winter season, using them for exclusive air cruises marketed by TUI Group company Hapag-Lloyd Kreuzfahrten (Cruises). From then on, D-AHLK kept its Kreuzfahrten titles, even though it was back in standard cabin layout for the following Summer seasons and flew to regular TUI destinations. On the contrary, Kreuzfahrten titles were removed from D-ATUF in April 2009 and the aircraft started to fly regular services only. It thus became kind of a retrojet, though this livery did not match the old Hapag-Lloyd scheme.
