Originally Posted by
UKtravelbear
It's not a simple as sticking a label on a bag.
Interlining bags places all sorts of obligations on the airlines involved which is why many are ceasing to do it for separate tickets.
It can cause them considerable expense if bags get delayed and people need to buy clothes and toiletries let alone the cost of couriers.
They are externalising as much cost and risk as possible, instead of being helpful to the customer and relying on being competent so that the loss is minimised.
They say "we won't transfer bags between separate flights, way too risky mate!" - I hear "We can't transfer bags for toffee, we'd have to pay out too much".
I note that some airlines, like Norwegian, while they are nominally an LCC, charge you some extra money for bag transfer. The charge is for connecting flight protection and bag transfer, so to issue the flights on one ticket. It's about EUR15. Other airlines could choose that middle ground of charging a bit extra for bag interlining to separate tickets.
We're a bit off topic now, perhaps we should continue over in the thread about BA (and Oneworld) not interlining bags to separate tickets thread.