Omni Coliseum (often called The Omni) was an indoor arena in Atlanta, Georgia, United States. Completed in 1972, the arena seated 16,378 for basketball and 15,278 for hockey. It was part of the Omni Complex, now known as the CNN Center.It was the home arena for the Atlanta Hawks of the National Basketball Association from 1972 until the arena's closure in 1997 and the Atlanta Flames of the National Hockey League from their inception in 1972 until 1980, when the franchise was sold and relocated to Calgary, Alberta.