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.
"Their highest goal is to ensure that the schedules are kept and that the customers are happy, also in the high season."