What is Huck and Jim's plan to reach safe territory?

Huck and Jim plan to ride on their raft to Cairo on the Ohio river.  Once they get to Cairo Huck and Jim are going to sell their raft and all of the stuff they got from the robbers, and buy tickets for a ferry.  They were going to ride the ferry north until they reach freedom.  Once they are safely in the free states, Jim is going to try to get his family back.