Kim overcomes her fear of flying by watching movies about peaceful plane trips, then talking to friends who fly often, then visiting airports. what treatment technique is kim most likely using?

The technique Kim is using is " systematic desensitization".

Systematic desensitization refers to a sort of behavioral treatment in view of the rule of classical conditioning. Systematic desensitization is utilized to enable the customer to adapt to fears and different phobias, and to instigate relaxation.