I'm taking a plane trip with my (almost) 3 year old. Having a sippy cup of milk around is essential. The TSA makes exceptions to the no-liquids-greater-than-3-oz plicy for babies and toddlers who need formula or breast milk. But what about a 3 year old who needs COW MILK?

And, if milk is not allowed through, where in the United domestic terminal in SFO (and JFK) can one buy milk?

This won't be the answer you want but, you'll not be suprised if you've been reading any other threads here. The answer is it depends. I've traveled with my almost 2 year old and been allowed to bring a sippy of milk through RDU but had to pour it out in BNA and BOS.

One trip was back before the secure area liquids were allowed on planes. Then I could pour milk from a bottle purchased after security into a sippy and that magically transformed it from a liquid capable of bringing down a plane and worthy of a diversion into a no threat liquid. Those sippy cups are amazing things.

You probably will find milk for purchase in most airports after security but don't count on it being whole milk and certainly not organic. Be sure to explain to your toddler that this is making him/her safer.

...in front of the screener who orders you to dump out the milk...

I am in awe of the sippy cup...

If she asks why I'm dumping out her milk I will say very, very loudly, "BECAUSE A MAN NAMED CHERTOFF IS A COMPLETE IDIOT AND HE DOES NOT WANT YOU TO HAVE ANY MILK TODAY."

Then again, I do want to get on the plane. Baaaa, baaaaa.