I disagree. I GUARANTEE you that this level of behavior had previously manifested itself in other situations requiring the child to be static for any period of time. It didn't require just stepping onto a plane for the first time to trigger this.
If this had been the first time ever that the mother had observed this behavior in Junior she would have been crying for help and desperate for any assistance at seeing this level of extended out of control behavior for the first time. Instead, she tried to "manage" while being oblivious to the impact of this extremely disruptive behavior.
I read on another thread that the mother was overheard telling a flight attendant that her child had behavioral issues. Just sayin'...