Airtran is now affiliated with Southwest. I believe their policies will be the same. When you check in ask about preboarding. They will give you a blue boarding sleeve for your ticket. There are usually special seating areas at the gate for handicapped. Pre boards will be announced for early boarding. You might also consider getting a wheelchair for both ends of the flight. It will help to expedite your travels to and from the gate and be more comfortable for your wife. If you are staying on Disney property, they also have complimentary wheelchairs at the resorts. If they've run out, ask them to get one from another resort. You can use them at the resort and take them on the bus and to the parks. Happy anniversary!