1st class is prioritised.
If you send a package on 2nd class it might chill at the post office for 1-2 working days before the mailing process begins (because they’re sorting out mail that came before yours) but with 1st class (providing you post it before the cut off time) it gets removed from the post office & the mailing process begins that same day.
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.
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