I've had a simular situation. Once the child is 12, they will need to board on their own. This is SWA's policy and the employees are not flexible. I don't feel comfortable leaving my son alone in the mass grouping that are sardined in-between the lineup poles. My solution is to have my son board solo using my A boarding, hoping that he can fend off others so i can sit with him. The issue is that carry-on storage space is limited once you board. SWA wants you to pay extra for business boarding so you both will board with A.
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