John F. Kennedy International Airport is one of the busiest airports in the New York City area, The Statue of Liberty, located on Liberty Island, is one of the cities biggest attractions.
There is a major difference between formal and functional regions. Formal regions are huge areas that are characterized by many activities. A functional region is a region that serves other regions, like major cities serving rural areas.
Second difference comes with the structural difference. Formal communication has a formal and well defined structure. Informal does not have a structure. There is a clear authority to report and get the instructions in a formal communication.