Originally Posted by
SPN Lifer
… estimate there is a 95% chance of the AmEx credit posting correctly if TravelBank funds are purchased immediately after selecting UA as one's airline with AmEx -- or even shortly before selection -- as opposed to a 99.9% likelihood if waiting 24 hours. ...
Well stated, concur. Slightly lower chance of a Murphy’s Law* violation (computer glitch, IRROPS, dog ate the credit, you did it wrong, etc.) with waiting 24 hours. Unless it’s an emergency**, wait the 24 hours, or even 48 hours to get to 99.999%
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(* Murphy's law is an adage or epigram that is typically stated as: "Anything that can go wrong will go wrong." In some formulations, it is extended to "Anything that can go wrong will go wrong, and at the worst possible time.")
(** “Poor planning on your part does not constitute an emergency on AmEx’s part.”)