There are 3 levels, but most of the 2nd and 3rd floor side viewing balconies are 'reserved' for either VIP access or 'friends and family' access.
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The Terminal 5 (also known as T5) addition, which is connected to the TWA Flight Center, is a 625,000-square-foot (58,100 m2) facility designed by Gensler.
T4 is the largest terminal at New York's John F. Kennedy International Airport and the only privately operated terminal in the United States. Covering nearly two million square feet, T4 is home to 34 airlines, has over 12,000 employees, and serves more than 21 million passengers each year.
The General Guideline for How Early You Should Get to the Airport. Generally speaking, most airlines advise that you arrive at the airport at least 2 hours prior to a domestic flight, and at least 3 hours prior to an international flight.