I understand and validate the concerns expressed about the pre-boarding passengers. But you need to also be aware that sometimes a person has a TRUE invisible disability. My 21 year old daughter appears perfectly healthy from the outside, but her autonomic system is out of whack which creates very complicated issues - she can pass out from standing too long, getting overheated, etc. So yes, she can walk around the gate unassisted, but I don't think you want her in the line-up process, or stuck in the hot gateway, because if she passes out, then guess what - the whole flight will be delayed while they call for EMTs. Believe me, she would GLADLY give up her disability and stand in line if she had the choice.
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