That sounds like a very likely explanation for this. Airlines, more than anyone, know about human factors in determining how errors can be designed in, or out. If Delta has data on this, and is profiting from this, even if it is clearly the passengers fault for not noticing, they should change the way in which the information is displayed. It is Delta, so that probably won't happen... but if this is a regular occurance, should they really exploit that for profit?
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