Delta Air Lines Inc. plans to reduce operations at Cincinnati's main airport from two concourses to one.

The Atlanta-based carrier also says it will take over the functions of a Delta subsidiary at Cincinnati/Northern Kentucky International Airport that provides customer and other services for regional airlines.

Delta said in a memo sent Tuesday to Cincinnati-based employees that all flight operations for Delta and Delta Connection flights now handled at two concourses will be shifted to Concourse B. Delta closed a third concourse in 2008.

Officials at the airport based in suburban Hebron, Ky., say they're trying to assess the impact of the changes. Airport CEO John Mok says about 120 concourse concession jobs could be affected.