1. This is the way it goes:
Parcels are formed up into dispatches (shipments). They are put into mailbags, and a manifest listing all of the parcels and their particulars is drawn up. Then the mail bags are schedule for flight out of the country.
2. If a particular mail bag did not make it because there was no more room on the Aircraft then they have to be reschedule for another Aircraft. It's not first come first service. Example it might be shipment 1 to 20 today, then tomorrow 21 to 40 and so on. So if mail bags 15 to 20 did not make it, they have to be reschedule for another day and so on.
3. And then there is this:
If there is more mail than available space to send it, items of higher priority win out over lower ones. As a rule, express letter mail is the highest priority, followed by express packets and parcels, then ordinary letter mail, ordinary parcels, and finally SAL. So if you are sending a parcel via registered airmail, but there is a very high volume of EMS shipments that day, there may not be room for your item, and it’ll have to wait for the next flight.
During times of high mail volume, there is likely to be a backlog of shipments waiting to be sent. Your parcel, of course, starts at the back of the queue.
4. Don't forget the above comment comes from the FAQ and my personal observation included. I don't work for China Post and I don't live in China.
5. As for your comment about the parcel left in the back to make place for the new one, I really don't know.
Thanks.
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