what makes 2nd class stamped mail slower to deliver than 1st class?

Question

Are there physically 2 ways to process the same mail in sorting offices, one is just slower? And what makes the 2nd class process actually cheaper?

In: 9

Answer 1

Basically 1st class gets prioritised all the way including by being put onto flights. So with 1st class if the route calls for it it is definitely travelling by air, whereas 2nd class will only travel by air if there’s extra space otherwise it either has to wait until there is space or get sent by truck road freight instead.