I'm flying on CI66 and CI55: CI66 flies via BKK, and CI55 flies via SYD. I might check some non-valuable (but fragile) items in my checked luggage, but I'm worried about how frequently the luggage will be handled.
I'm on two different planes and two flight numbers, but there are four legs to the journey so my luggage will be tossed about, loaded, and unloaded between two and four times.
Are there any general rules as to whether all the checked baggage on a direct flight is offloaded at a stopover, or only the baggage that's not continuing on the same flight? Is this up to the ground handlers at the airport, the airline, random chance on the day, or is it dictated by security protocols?