Why would someone go to Newark or JFK?

The following is a reconstructed in class discussion about airlines and aiports in the NYC area:

Prof: So, on the weekends, the price from Boston to Newark is more expensive than Boston to La Guardia. Why is that? Why would someone prefer to fly to Newark or JFK instead of La Guardia on the weekend?
[baffled silence]
Prof: Come on guys, what do you think?
Student: Because Newark and JFK are gateways for a lot of international flights so maybe people have to fly there to make a connection.
Prof: That's true, but gateways aside, why would someone want to fly to Newark or JFK?
[silence]
Another Student: I'm not sure, but maybe for the "Jersey Shore?"
Prof: [Exasperated] Yes! People live in New Jersey and they vacation in New Jersey so they want to fly there. There's this place called Queens, ever heard of it, a lot of people live there. You people think that Manhattan is it, then there's San Francisco and maybe there's Chicago somewhere in the middle. People not only live near Newark, there's this whole state called New Jersey.