Functional communication training (FCT) provides an efficient means for reducing a variety of challenging behaviors while increasing social communication. After establishing a functional communication response (FCR), interventionists may need to design a program to thin the schedule of reinforcement to provide more durable effects and maintenance in the natural environment. Hanley et al. provided one means for thinning schedules that involved the systematic introduction of extinction (or denial trials) following a process of delaying reinforcement. This study evaluates a southeastern U.S. classroom application of this thinning process with three elementary age students who engaged in a variety of aggression, self-injury, disruption, and crying. The results indicate positive effects of the FCT program with systematic introduction of denial trials once the participants demonstrated proficiency with the FCR. In addition, data for two participants show prolonged effects post-intervention. Results are discussed in terms of extending Hanley et al. and how these procedures can be used within typical school-based settings.