Here is an example.
Decades ago, as I was emigrating to the US in the winter holiday season, a courier I had arranged was supposed to collect the paperwork in the US that I needed for my visa. After several days, nothing had happened.
The university in the US engaged FedEx, their regular courier, and I rented a car, drove to the airport (Schiphol) where FedEx allowed me to collect my paperwork straight from the plane (desk), after which I drove to the American consulate and got my visa right before the consulate shut down early because of new year.
My flight was leaving, pets and all, when the consulate was still closed.
The fact that everything else worked out too… that was great. There could so easily have been a snag on my way back from the airport.)
But if it hadn’t been for FedEx…
So whenever I can, if I need to use a courier, I will use FedEx. (I’ve held an account with them once or twice.)