Just flying in and out - while there are many factors, I think it's mainly education, if you know why you're breastfeeding and all the benefits, then you KNOW why it's worth persevering through hard times, you KNOW whether you need to supplement with formula or not, you KNOW it's your right to breastfeed wherever you want, you KNOW it's normal and boobs are actually for a baby's nourishment, and not just simply nice looking accessories.
And other people KNOW that what you're doing is feeding a baby, big deal.

It's said that knowledge is power, and I reckon that I couldn't have been as strong and determined to persevere with many of my choices I've made for River if I hadn't looked into those topics for myself.

That said, that's not to say there's absolutely no place for formula, but if mothers can be taught FIRSTLY to give breastfeeding a really good shot, because of all the benefits, and supported and encouraged through their problems, or even to supplement with formula as opposed to making a complete switch.