Airport is a national border that links one country to countries all over the world, including South Korea. The link for Korea is Incheon International Airport. Passengers, freight and airplanes take off and land at this place. With 30,000 airport employees working to keep the airport open 24 hours a day. 21 government agencies are located on the airport premises. Airport is more than just an airport: It is a small city. Just like how one airplane part is essential to the safety of the whole flight, every single person who works at Incheon Airport plays an important role in handling the airplane take-offs and landings. "Aircity" is a story about these dedicated people. When your plane ticket is processed and board a plane after having a seat assigned to you, then the pilot will navigate the plane to your destination. After your plane lands, you need to go to the exit gates. It looks like a simple but in fact takes lots of procedure behind and Aircity will show you what happens behind the scenes as people work hard to make your flight arrive on time without a problem. The characters of this drama harbor a common goal to establish another aircity in the African continent. The goal accompanies many challenges and the characters overcome those challenges one by one. They are courageous and aggressive when it comes to work but the stories of their love is sometimes difficult, foolish and a bit clumsy. But as much as they are faithful to their passions and dreams, they are always respectful of others. Han Do Kyung, specially scouted by the Incheon Airport Director, come back to Korea as the chief of operations of Incheon Airport with much lower salaries. However, Do Kyung lives with an uneven wound of her family and a regret of leaving her sister behind. She met Kim Ji Sung, a National Intelligence Service agent and gets entangle with him. Kim Ji Sung is very passionate about his work to the extend that he is willing to bend the rules to ensure the security of the country even if he is only acting on his instincts. After being stationed at the airport, he finds himself in an emotional turmoil with a woman he used to love. At the same time, he is falling for Han Do Kyung. Kang Ha Joon, a childhood friend of Han Do Kyung is also falling for Do Kyung. Kang Ha Joon is a quick tempered with a habit of talking aggressively due to his nature of work watching over thousands of surveillance cameras in the airport but has good relations with all the airport employees even the cleaners because of his kind personality outside of work. As his friendship develops with Do Kyung, he becomes a strong source of refuge for her. But as his feelings for her grows, his relationship gets more and more complicated with a woman who is his friend, superior at workplace and unrequited love.