Like I’m always curious about how they get packages over states like is there a separate USPS truck or is the post office truck just going across the country overnight?
And mostly international shipping like how the plane process works

They use these things called airplanes

Gone Postal

or

The Great Postal Heist

Maybe there's something on a How Stuff Works vibe that did an episode on it? idk

It’s like swinging, they come and they go

What on Earth is above

Eyes Wide Shut