I knew it was

Young blonde called to make reservations: I want to go from Chicago to Hippopotamus, New York. The agent was at a loss for words. Finally, the agent: Are you sure that’s the name of the town? Yes, what flights do you have?” replied the blonde. After some searching, the agent came back and said: I’m sorry, I’ve looked up every airport code in the country and can’t find a Hippopotamus anywhere. The blonde retorted: Oh don’t be silly. Everyone knows where it is. Check your map! The agent scoured a map of the state of New York and finally offered:
You don’t mean Buffalo, do you? The blonde exclaimed, full of joy: That’s it! I knew it was a big animal!