Chattanooga Metropolitan Airport has one concourse with eight gates. In March 2024, the airport added two additional boarding gates along with a new restaurant, gift shop and business center. This completed an expansion that saw an additional 26,000 square feet of a new terminal wing constructed and 36,000 square feet of the existing terminal renovated. Airline service is provided by United Express, Delta Air Lines, American Eagle, and Allegiant Air. The largest aircraft currently serving the airport are the [[Airbus A320 family|Airbus A319/A320]] and Airbus A321 (operated by [[Allegiant Air]] and [[Delta Air Lines]]) and even the [[Boeing 757]] (operated by [[FedEx Express]]). The McDonnell-Douglas MD-80 series aircraft used to be one of the larger aircraft that serviced CHA, but these were retired early because of the [[COVID-19]] pandemic.<ref>{{Cite web|last=Pallini|first=Thomas|title=What it was like on the last fight of a Delta McDonnell Douglas 'Mad Dog' jet which were all just sent to an early retirement after 33 years in the sky|url=https://www.businessinsider.com/delta-retires-md-80-series-aircraft-send-off-in-atlanta-2020-6|access-date=2021-03-08|website=Business Insider}}</ref> Delta had flown a mainline service from 1947 until withdrawing in 1995 after 48 years in favor of affiliates like [[Atlantic Southeast Airlines]] operating smaller regional jets, such as the [[CRJ-200]]. Delta subsequently decided to resume its mainline service flights, including DC-9s, to Chattanooga in September 2012.<ref name="Delta's DC-9 jets return to Chattanooga after 17 years">{{cite news |title=Delta's Big Jets Return for Atlanta Flights|first=Mike|last=Pare|url=http://www.timesfreepress.com/news/2012/sep/06/deltas-big-jets-return-for-atlanta-flights/|newspaper=[[Chattanooga Times Free Press]]|date=September 6, 2012|access-date=February 2, 2013}}</ref><ref name="Delta returns DC-9 jets to Chattanooga after 17 years">{{cite news |title=Delta Returns Daily [Mainline] Flight to Chattanooga After 17 Years|first=Carla|last=Caldwell|url=http://m.bizjournals.com/atlanta/morning_call/2012/06/delta-returns-mainline-flight-to.html?ana=yfcpc&r=full|newspaper=[[American City Business Journals|Atlanta Business Chronicle]]|date=June 12, 2012|access-date=February 2, 2013}}</ref>