i fly from the cologne-bonn airport pretty regular and sometimes, if i got time to kill, i sometimes stop by the visitor's terrace and there are always some parents with their kids - the kids seem to have fun.
however, generally its not that spectacular, since there is not the traffic volume like in frankfurt and also, since there are no intercontinental flights, there are no larger airplanes (except you see the iran air one going to teheran). mostly you will see boring germanwings a319, since its their main hub.
if you are stuck at the airport anyway or wanna make your kid happy, stop by for a while.
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