we took our daughter on a plane to disneyworld when she was 12 months old also. We brought a portable DVD player with all her favorite movies, LOTS of snacks, and were told by our pediatrician to give her a bottle or sippy cup to suck on for takeoff. We gave her the bottle at take off and she fell asleep about 10 minutes later, and slept for an hour, so the last hour of the flight, we just had her watch movies, kept her busy, and gave her snacks. The flight went great! Just keep in mind, if you remain calm, so will they!
