B777 Undifferentiated or Other Model
Dispatch Dispatcher
Communication Breakdown
Deviation / Discrepancy - Procedural Weight And Balance; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Hazardous Material Violation
General None Reported / Taken
Human Factors
Air Carrier Ground Agent 1 in ZZZ called coworker and stated that some MISC HAZMAT (hazardous material) had been placed in position 6R. Apparently this had been loaded into this can 2 days prior; and they didn't realize this until the aircraft had already taken off.   I then talked to Agent 1 about the situation and had him to send me the HAZMAT paperwork. Called the Director of Operations and informed of the situation; and also informed the crew of what had happened. As showing on the paperwork; it was Class 9; MISC; 804KG - position 6R. The cause was with the holiday; it caused the ramp to lose track of the can where this HAZMAT was and the paperwork that needed to be with the HAZMAT material. I suggest when there is a holiday; the ramp needs to make sure that they are extra careful about where the HAZMAT is and the [related] paperwork is.
Air Carrier Dispatcher reported Hazmat cargo was inadvertently left on aircraft over the holiday weekend without appropriate Hazmat documentation.