How does interlining bags actually work?
I'm curious as to how interlining works considering OW carriers won't interline bags on separate tickets, but I'll use a hypothetical example where there's a non-IAG/OW carrier involved.
Let's assume I land at JFK on a domestic JetBlue flight (T5) and want to transfer to BA (T7), is the issue that these carriers won't interline by bags, or that they can't interline my bags?
I understand that the key business issue at stake is that BA doesn't want to be responsible for the costs of a lost bag, which they're on the hook for even if JetBlue loses the luggage, but who actually transports the bags from the plane to the terminal, around the terminal, or to the next plane?
Let's say there's an outstation which lets me print luggage tags, attach them myself, and then take them to a drop-off point. Since I have access to a printer, I sneakily print my own tags at home with LHR as the final destination. Will my bags magically make it to London?