Final answer:
The purpose of 'b' is to locate the nearest city with an international airport to each location listed, often for a Real-World Geography Exercise.
Step-by-step explanation:
The purpose of 'b' in the given scenarios is to locate the nearest city with an international airport in proximity to each location listed. This task is typically part of a Real-World Geography Exercise, which may include further activities such as calculating distances and travel times from different airports to these cities.
Using tools can assist in both locating points of interest and finding the nearest international airports. An example of such an activity could be identifying the nearest international airport to a remote tourist destination and then calculating the flight distance and time from a major airport like John F. Kennedy International Airport in New York City.