Passenger on a Frontier Airlines JFK Terminal. For parents who are traveling with children, Kennedy International Airport (JFK) can be a stress-free and affordable place to be. Terminal 1, which is used by Frontier Airlines, is renowned for its effectiveness and simplicity, which can greatly simplify airport navigation. Whether you're traveling alone, with family, or on business, Terminal1 has all the amenities you need to pass security and check-in without incident. Family-friendly facilities like accessible restrooms and areas to unwind are available at the airport for parents. Travel with children can be made more pleasurable by starting your trip off right with a little preparation and a laid-back mindset. What to anticipate when traveling with Frontier Airlines out of Terminal 1 at JFK.