Airlines have had and continue to have their cabins sectionalized. For example, there is first class, business class, and economy class, and there used to be smoking and non-smoking sections. The benefit of such sectionalizations is that, for a price, it allows travelers to have greater comfort in accordance with their preferences and budget (although in the smoking days price was not an issue). Unfortunately, there is no sectionalization at any price to sit in an infant/child-free zone. While not a matter of undue importance on shorter flights, on long-haul flights such as from Mumbai to Entebbe (or for that matter from Honolulu to Phoenix) surrounded by hyperactive youngsters and screaming babies and sounds that no one has heard since uttered by Gerald McBoing Boing the Noise-Maker Boy can turn a difficult journey in the best of circumstances into a flying nightmare. It can even cause an otherwise water-off-a-duck’s-back un-ruffleable senior citizen who has never written a letter like this before to do so as a plea to airlines. They might even find such a sectionalized alternative to be the source of another profit-enhancing fee.
PS: If you complain to American Airlines about the inefficient system it has for transferring passengers from its commuter terminal to its actual terminal, by buses, without regard to your valid connection time, you might not find that its promise to look into the matter and make appropriate changes will be kept, but you just might get a couple of hundred bucks of travel vouchers.