Clavendog, my husband and I flew up from DFW to Cleveland and back to pick up our Yogi from his breeder in PA. It was a 2.5 hour flight and a 2 hour drive between the breeder and Cleveland, another 45 minutes from the airport home. Yogi's adventure is chronicled here:
http://www.goldenretrieverforum.com/golden-retriever-puppy-up-1-year/123647-introducing-our-newest-addition-yogi.html#post1859529. There are some photos of Yogi at the airport and on the plane and the first post details our adventure so I won't repeat it here.
Before we did this I did a lot of internet research on flying a puppy in the cabin. The best advice was on this forum. You can do an advanced search (brown bar on main page) and find all the posts where puppies are flown in the cabin. I eliminated the ones about flying them in cargo (there are more about that). I noted everyone who posted about their experiences and then PM'd them to ask questions... and EVERYONE was very helpful! Thanks guys- you know who you are! I got a lot of great advice, including wrapping the bottom of the sherpa bag (the support board) with saran wrap and multiple piddle pads, taking baby wipes (OK for TSA requirements), paper towels, a blanket for the waiting area and a little water bottle (empty for TSA requirements) and a little food/treat. Don't forget a collar and lead (with a tag) because you will probably make a few potty pit stops before arriving at the airport.
Check with your airline to see if you need a health certificate to board and what their boarding policies/fees are. As airline employees we had it really easy in this regard- no health certificate and no fees or check in requirements. There was a limit of 7 dogs on board in coach and 2 in first class, but we were the only people with a nice little puppy. Had there been a bunch of revenue dogs, then we would not get that flight.
As Yogi's thread mentions we got a row in coach, and once airborne the flight attendants allowed up to just strap his sherpa in the seat between us. They didn't make us put his sherpa underneath the seat, just on the floor for take off and landing. It's going to depend on the crew as to what they will and won't allow you to do. We were in the back and the flight attendants wanted to talk to us about him during their down time. Puppies usually sleep on the flight (someone mentioned here that their puppy screamed, so it's not universal!). Yogi was quiet as a mouse- the kid in the first row of coach wasn't.
I'm sure you are planning to spend all the formative weeks socializing the puppy to as many new sights, sounds and people as you can. The airport is PERFECT for that. Yogi got to meet the car return people, the people in the bus to the terminal, all of the TSA agents on duty that day (Yogi was a rock star with them), and dozens of people in the terminal as we waited for the flight. He met all the airline crew and employees working the flight and some members of a jazz band playing in the terminal. He even met several people at the rest stops we went to. When we arrived there were people in the DFW terminal wanting to meet him, including several employees on the employee bus.
Now my little guy is totally distracted from pooping when he hears air traffic overhead. He had a wonderful experience.
My last piece of advice is to take precautions in the airport and on the plane- I picked up a bug from my flight and it made the first several days of middle of the night potty training absolutely miserable!
Good luck! Please let us know how it turns out for you!