|Quoting smi0006 (Reply 4):|
Quoting redflyer (Reply 2):
In this instance, it would be a wash since whatever isn't carried in the baggage compartment will be carried in the cabin instead, so it won't affect W&B.
Not exactly how it works, it will be accounted for differently in the hold. When offloading a piece of hand-luggage into the hold it has to be tagged and the hold weight updated.
Interesting point you bring up and I had to think about it for a moment. But the premise is if a 21" suitcase goes into the baggage compartment, does the weight calculation have to be altered if it instead goes into the overhead bin. On its face, the answer would be no, because all you are doing is taking the 21" bag from below and putting it topside. And the OP's post was asking if W&B have to be recalculated because, in order to get everything into a 21" bag (typical size limit for an overhead bag), people will stuff more into it (make it more dense). All that means is that 50lbs of personal effects will be carried in a 21" bag instead of a 26" bag. The density will be different, but the weight will still be the same. So from an actual W&B standpoint, it should make no difference.
On the other hand, and to the point you make, airlines probably do account for different weights per bag going into the hold vs. overhead bin because the baggage compartment can hold more weight per sqft, and the baggage going into the hold will typically be heavier by virtue of the fact that the reason it's going into the hold is because it is either too big to fit in the overhead bin, or it's simply too heavy for the pax to carry. In other words, on average, the typical bag going into the under-floor hold is heavier - because it's bigger - than the typical bag going into an overhead bin.
That's my story and I'm sticking to it.