Re: Flying with frozen/nonfrozen milk...
you won't really need to store very much milk while you're away. aim for 1-1.5 oz per hour while away, so if you're away "several" hours friday that's, what, something like 6 oz? and you'll be pumping at least once on friday while you're away from baby, so you can feed that saturday, right?
have you tried pumping yet? do you know how much you can get from a pump session while you're fullptime feee=ding (ie "extra"?)
anyway, i would not freeze the milk, i'd just pump the last few days on vacation and keep it fresh. i wouldn't re-freeze thawed milk, so i wouldn't take the risk of it thawing and needing to use it up before friday. i also would store in milk bags for the airplane - way easier to travel with. put the pumped milk in storage bags, put them all in a ziploc, put that in a cooler with a separate ziplock of ice which you can dump right before security and then an extra dry ziplock you can refill from a restaurant right after security - i got hassled when my ice melted a little and then that was "unapproved liquid". if you don't open the cooler for anything else, it should stay cold enough with no problem. i would not expect to be able to use the plane freezer at all.
and depending on how much you can pump, i'd plan to pump on thursday when you're home as well and maybe you won't even need to do all this pumping and flying with milk pain.
Nursing, pumping, cloth-diapering, babywearing, working professor mama with the awesomest SAHD ever.