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Luggage cart, Scenera. He can ride it in if he wishes. His laptop lunch is sitting in there. Large cooler bag full of food, which is a must for us due to multiple severe food allergies. So glad we had it that day--we can't eat anything at the airport.
(Okay, my camera bag is also in the cooler bag for the flight itself).
Noodle stowed beneath Scenera in case we wanted to RF in our rental car.
Overstuffed laptop bag with coloring books, triangular crayons, ipod, laptop, change of clothes for kiddo, potette for kiddo, small toys, meds for both of us.
I recommend carrying on as little as possible. It's hard, though, for us because our food needs require a substantial amount of carried-on food in case of emergencies.
The carry-ons either get slipped on over the carseat or kiddo rides in the carseat and I toss the laptop bag across my body and carry the cooler bag in one hand. Extra wipes go on the very top of it all so that I can wipe down handles, seats, trays, etc, as I go.
Kiddo has the iPod Touch plugged into a USB charging station.