Wildcatting is when the members of a union illegally walk off the job with no warning.
In this case it appears that some of the bag-chuckers at AC were getting their friends to clock them out of work later than their actual finish time (thus either collecting overtime, or going home early.) Management got wise to the scheme, and installed cameras, catching people in the act. Punishments were handed down, and the workers walked off in solidarity with the punished. Result: major delays, and pissed-off pax. Unbelievable, considering their company just got out of bankruptcy protection..