[After Garibaldi and Sinclair trick Ivanova into thinking she slept through breakfast]Sinclair: I'll notify your next of kin.
Garibaldi: 4 ... 3... 2 ... 1 ...
Ivanova: OH! GARIBALDI! YOU'RE A DEAD MAN!
Toward the end of the episode, Ivanova says that if Babylon 4 ever re-appears, she will go while Garibaldi stays behind. This is precisely what happens in War Without End.
According to folklore, the Flying Dutchman is a ghost ship that can never go home, but must sail 'the seven seas' forever. The Flying Dutchman is usually spotted from afar, sometimes glowing with ghostly light. If she is hailed by another ship, her crew will often try to send messages to land, to people long since dead.