I agree with all sides- the devil's in the details, but there does need to be some latitude with kids-
The most well behaved kids, with the best, happiest, most disciplined parents, will melt down from time to time- esp in a strange environment.
I actually hate to see people get so bent over a crying child- babies cry- get over it- adults in America tend to forget that they are also responsible for how they react- ever hear of ear plugs and noise canceling headsets- none of which replaces being a relaxed person-
Acting out and won't stay seated crawling over other passengers is a safety issue and a whole other thing-