He explained it in the paragraph that starts with "Other airlines either don't get it, or can't" - different-sized planes accomodate different amounts of luggage per passenger, so there's a risk that they'll run out of room for all the baggage when passengers transfer to smaller planes. Identical planes eliminate this risk.
I didn't realize that when your luggage is 'lost' on a multi-stop flight, it could actually be a deliberate decision on the part of the airline due to lack of capacity. I'd actually rather they told me that.
Plus many carriers store luggage in 'cartons' - metal containers with the bags stacked inside. These are put on with a special forklift thing. Essentially offloading all of these can happen fast. If you are being super smart, you can stick connecting flight backs in these cartons, and literally just drive over to the next flight and load.
Right. But the different types of planes are going to different destinations. So you would fly your 737 to your hub and then use a plane with more cargo space for the flights expected to have scuba gear or skis. In this way a mix of planes might be more efficient.
I didn't realize that when your luggage is 'lost' on a multi-stop flight, it could actually be a deliberate decision on the part of the airline due to lack of capacity. I'd actually rather they told me that.