Danish-German ferry group Scandlines has logged further growth over a strong summer period.
It said three "very good" months had given it an optimistic view of the future.
The ferry service was stable, with almost a million vehicles and more than three million passengers transported.
There were no cancellations due to technical issues.
"This is a tremendous logistic task which can only be carried out by a perfect team of staff members on board the ferries and in the harbours," the owner said.
