Airlines allow passengers to carry a "personal item", that "fits under the seat in front of you", such as a shoulder bag, purse, laptop bag or other small item.
Have other travelers found airlines offering resistance to allowing a motorcycle helmet as a "personal item"?
On first look, it appears that the typical helmet is on the upper limit of under-seat space, but looks like it would fit in most/many cases.
A more general question about bringing all kinds of motorcycle gear does exist, but this question is about whether those who actually brought helmets on flights had any problems getting aboard with both a helmet AND a carry-on. In other words, would an airline gate agent stop someone who held both a typical 22" rolling carry on, plus a motorcycle helmet?
There is a helpful question that elucidates experience on various airlines with the carry on baggage count, which is essentially what this question is about: what have travelers carrying crash helmets experienced when the helmet is a second carry-on?