A method, system, and computer program product for providing a program interface for communications between a manufacturing execution system (MES) and a transport system are provided. The method includes initiating a communication with the transport system, querying the transport system for a list of active transport jobs, and inspecting a response to the querying and identifying carriers for notifying the MES of load complete and unload complete requests. The method also includes notifying the MES that identified carriers are ready for respective load and unload complete actions. Upon determining a malfunction occurrence between the MES and the transport system, the method includes using results of the querying and inspecting to provide a status of the active transport jobs, and deleting carrier IDs for the identified carriers from the list of active transport jobs in response to the notifying.