The Domestic Terminal (Terminal South) of Hartsfield-Jackson Atlanta International Airport (ATL) is home to Spirit Airlines' Atlanta office. Spirit Airlines Atlanta Office This office is the airline's customer service, check-in, and ticketing point of contact. For help with reservations, flight modifications, baggage questions, and other matters, travelers can stop by the counter. Employees at Spirit Airlines' Atlanta office can assist with seat selection, cancellations, and other services. Spirit Airlines departs flights from Concourse C. According to flight schedules, the office opens three hours prior to the day's first departure and closes after the final flight. Travelers can also call Spirit Airlines' customer support if they have any issues or need help.