Notice which cities have the biggest increase in passengers as an origin and which cities as a destination. Is there any overlap in the lists? What characteristics do each of these subgroups have?
In your answer name the cities that have the biggest increase as an origin and report what they have in common. Then name the cities that have the biggest increase as a destination and again report what they have in common.
Finally, make a claim that could explain this overlap. (i.e. do you think the passengers are visiting relatives for the holiday or do you think there are other considerations that are driving the decision to travel?)