Comment by Zababa

> With modern technology, the USPS estimates that a similar sized letter would take a maximum of five days. With planes, trains, and automobiles available to us, we’ve shaved off about two days.

> Two days. In 165 years.

Going back to the start of the article, just like the Pony Express was closed due to telegrams, letter speed is not that important most of the time thanks to phones, internet, etc.