Blank sailings have been traditionally used as a tactical tool to manage supply to bring it down in line with demand. Over the course of the pandemic, as demand plummeted, carriers resorted to blank sailings once again to ensure that vessels were not deployed empty. However, this was not the case across every alliance service. To see how susceptible a service is to blank sailings, we introduced a measure called ATBBS (average time between blank sailings). This is basically the average number of weeks between a blank sailing on each respective service. (....)