Strong demand in travel has sent Carnival (CCL -0.83%) shares up 60% over the last year, but the stock's recent pullback could be a great buying opportunity, according to analysts at Stifel Financial.Following another strong earnings report last week, Stifel maintained a buy rating on the stock. The firm knocked $1 off its previous price target, but at$25, the analysts still see 54% upside over the next 12 months or so from the current share price of $16.21.Why analysts like the stockThe cruise industry is ...