what terminal is Frontier airlines at ATL offers a faster check-in and ticketing experience on Concourse T of the Domestic Terminal. Frontier's check-in counters are prominently situated in this concourse, complete with self-service kiosks for printing boarding passes and checking in for flights. These kiosks are intended to speed up the check-in procedure, allowing customers to swiftly tag their bags and proceed to security. For individuals who want personal assistance, Frontier Airlines employees are stationed at dedicated counters throughout Concourse T, providing support and addressing any concerns that may arise. The location of these counters within Concourse T allows for simple access and efficient processing.