45% of ships travel empty🛳️

I want to create the last minute of the ship. I work on port, and I discovered one particular metrics :

45% of ships travel empty.

My goal is to offer discount price for agent to book empty travel ship.

I would like to scrap website like https://www.marinetraffic.com/ or https://www.vesselfinder.com/fr or https://www.myshiptracking.com/fr/

What do you think about the idea ? Do you know similar idea ? Do you think I can make something easily ? Because i'm not sur I can find this information on internet.. Ship that travel empty. But probably possible by dealing with maritime agent...