Question: Which British shipping line has a full title incorporating Boston Packers, and operated the SS Justicia?
Sentence (from "SL ferries"): SL ferries (short for Swedish "Skandinavisk Linjetrafik" or Scandinavian Line Traffic) was a shipping line that operated with car ferries in the central part of Øresund, between Copenhagen, Port of Tuborg, Zealand, Denmark and Landskrona, Scania, Sweden.
Relevant evidence: No