This is directly from the TSA website (http://www.tsa.gov/travelers/airtravel/children/formula.s....
"When traveling with your infant or toddler, in the absence of suspicious activity or items, greater than 3 ounces of baby formula, breast milk, or juice are permitted through the security checkpoint in reasonable quantities for the duration of your itinerary, if you perform the following:
Separate these items from the liquids, gels, and aerosols in your quart-size and zip-top bag.
Declare you have the items to one of our Security Officers at the security checkpoint.
Present these items for additional inspection once reaching the X-ray. These items are subject to additional screening.
You are encouraged to travel with only as much formula, breast milk, or juice in your carry-on needed to reach your destination."
I flew with my daughter when she was 6 months old and we had 3 different planes flying from Louisville, KY to Anchorage, AK. Very long day. My daughter was also bottle fed and I used the playtex with the disposable liners. I think I took 2 or 3 prepared bottles and had a can of liquid concentrated formula in the diaper bag (don't forget a can opener) and a Nalgene type bottle. I also had a baggie full of extra liners and nipples and an empty baggie for dirty nipples. When I needed to make more formula all I had to do was pour the formula to the nalgene bottle and add bottled water. If you are worried about any leftover formula going bad you could take an icepack with you to keep it cool ( should be good for 24 hours). They also have ready to feed bottles like you get from the hospital available at some grocers now, all you need to do is attach a nipple. The disposable liners worked great for traveling, no bottle to wash and new liners and nipples didn't take up much space.
I read a bunch of stuff on flying with babies and the best advice was to feed them while taking off and landing, the sucking action will help their ears pop. Also make sure to bring plenty of diapers. I had enough diapers in my diaper bag until I was delayed on my last flight. Cincinatti airport staff did have diapers but not in my daughters size, they had to get diapers out of my suitcase for me. If your daughter has a favorite toy try and attach it to a pacifier clip, when she does throw it at least it won't end up on the ground.
Hope you are seated around other parents and travelers willing to entertain your daughter, mine was more content to look around and smile back at other passengers than to play with toys, and once we got going she fell asleep.
Good luck