K.M.
Traveling with your baby really isn't all that bad. We started flying with our son when he was just 2 months old and now at 10 mos, he is a flying pro! This is what we did:
1) You don't have to purchase a seperate ticket for your child until he is 2 years old. You can hold her in your lap and all you have to do is to pay a small tax. They will still issue your daughter an infant ticket to board. When you check in, ask the agent if the flight is full and if it isn't ask them to put you in an aisle that is empty. Many airlines will try and accomodate you, if you are traveling with a baby. You will not be able to sit in an emergency row exit with a baby.
2) Best seats are by the window for privacy, especially you are breast feeding.
3) I have a Graco infant car seat and the stroller frame that the car seat attaches into. I bring both and check them both at the gate. They will have you leave them right at the entrance of the plane. When the plane arrives, you pick them up at the same location. Both are too bulky to bring on the plane, so they will ask you to check them at the gate
4) Try not to board the plane until you absolutely have to. I know it seems nice that they let familes get settled on board first, but babies get antsy, and you can't move around once you are sitting down. Before I board, I change my son's diaper and then I go to a coffee store and ask for a cup of hot water and make my son's formula bottle before we board. My son takes his formula on the lukewarm side, so I make sure the bottle is fairly warm before I board so I can give it to him when we take off.
5) If you are breastfeeding, try to hold off until the plane is about to take off, so that the sucking can lessen the pressure on their ears. If your baby is really fussy, offer your breast or bottle right away.
6) If you don't want to breastfeed, but have pumped milk with you, ask the flight attendant for some hot water before you take off, or get a cup of hot water before you board and place the water in the "barf" bag and place your bottle inside. Close up the bag and your bottle will warm up nicely. Because the bag has a plastic liner, it won't leak.
6) Bring snacks and portable toys to keep baby occupied. Bring your usual diaper bag items in case you need to change her during the flight.
7) I'm not sure what documents your daughter will need for a domestic flight. We were always traveling internationally, so my son has his own passport, which we always present. I would call the airline you are going to travel with and ask them if you need any documents for your infant. I think if you are traveling alone, without your spouse or sig other, you may need a letter from your mate advising his acceptance of you flying with the child alone.
Good Luck! Send me a note if you have any other questions.