So as you all know when Kate was a child she had a childhood sweetheart called Tom Brennan. Tom grows up and becomes a doctor while Kate grows up becoming a criminal and later on a fugitive... anyways after the plane crash you see that Kate has a crush on Jack. I think the reason of that is because Jack might have reminded Kate of Tom who she loved. Even on season 4 when Jack starts going toward Juliet more than Kate, Kate still wants more of Jack.
This is just my opinion.... Eli815 13:33, September 23, 2010 (UTC)