I should have known the fat-finger cheerleaders would show up.
What evidence is there that it was an error? That's what the airline says - but what else would you expect them to say???
You should know that any airline subjected to any allegation of misconduct here is clearly in the wrong. Doesn't matter what the airline says. They can't be trusted after all, once they have aroused your suspicion.
I, personally, suspect it's a), b) and c). Why don't they open their books?
The US Government should investigate. Specifically the DoT.
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