disappearing ship

[fosterco]

I'm really spacing on this. Can anyone tell me when and how the ship disappeared? For the life of me I can't remember.

[LexLuthorMetropolis]

The ship disappeared when Professor Fine was supposedley killed in the FoS to whereabouts unknown.

[UpandAtom]

Lex thought that Lionel took it back in "Solitude" but in this episode he acts like he has no idea what happened.