Commercial Fixed Wing
Time Pressure
Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Weight And Balance
General None Reported / Taken
Human Factors
I was working Aircraft X ZZZ-ZZZZ1 at gate and had planned the flight according to the [Manifest]. One of my agents connected a cart of freight going to ZZZ2 to a string of carts that was going to ZZZZ1 unbeknownst to me. Since all of the carts were together; I scanned all of the carts for the flight going to ZZZZ1. The last cart of freight was a pallet going to ZZZ2. At first I had no idea that it was going to ZZZ2 so I scanned it just like I scanned the other cart before it since it was DG for ZZZZ1. When I scanned the cart for ZZZ2 the barcode wouldn't scan so I had to enter it manually. I did and confirmed the weight. I did not get an error message stating this was freight for ZZZ2 the scanner allowed me to add it to my flight for ZZZZ1 and I continued on my work.  I was moving from AFT to FWD of the aircraft to ensure the operation runs smoothly on my gate. I am the Lead. I instructed my agent in the back to load up a cart of bags and a cart of DG (freight) and to surround the DG with 15 bags. I went to the front of the plane to check on the crew working there. When I returned to the rear of the plane all three carts were loaded including the freight for ZZZ2. When it became time to close the flight on the scanner the scanner asked me to confirm if everything was loaded and again no error message was displayed and since everything was in fact loaded; I confirmed that everything was loaded. Still nothing on the scanner told me that I had freight for another destination; in this case ZZZ2 going to ZZZZ1. I didn't realize I had loaded the ZZZ2 freight to ZZZZ1 until the plane was already gone and I was already working the next flight on my gate and the cargo coordinator questioned me about the freight that it was missing from the gate. I notified my supervisor and spoke with safety to file a Report and the Cargo Dispatcher regarding the incident.
Air Carrier Load Controller reported inadvertent transport of Hazmat cargo to wrong destination.