The hatred between City and United has been going on for decades and why people think it will change any time soon baffles me.
It started many moons ago and was fueled by out of town support, i.e. Cockney Reds. Who used to call us Northern Wankers ( the irony ).
There is still a degree of this from out of Towners who come here for the big day and don't live in the Manchester environment so have no bond with
the City or no mates who are City fans.
You then have the younger element, which every team has, who, like you see even in non related football incidents want to have a go at rival gangs.
Also people who have too much to drink, get carried away and maybe regret their actions when the sober up.
City and other Clubs are just like Airport Departure Lounges, they will sell you as much drink as you want but then if you misbehave they are blameless.
As for Aeroplane Gestures it the same as Spurs fans calling themselves Yids and chanting Yid Army. Chelsea, Arsenal and the London Clubs all call them Yids.
So until Spurs eradicate this it will not go away and the other fans will be blamed.
Same goes for Aeroplane gestures, Until United take action against their own fans you will always get a retaliation.
You can only wonder what will happen between United and Leeds if they get promoted.
And lastly as this has been a regular occurrence at Derby matches wouldn't you think the Club could erect netting between the rival fans to prevent objects being thrown.
And keep the first couple of rows clear on the upper stands to prevent cups of piss being thrown down.