Originally Posted by
ozzie
The reason airlines don't want to do it is that the carrier that initially takes your luggage is ultimately responsible for it if it gets lost. .....
No they are not! You have the rule backwards: for IATA airlines, the airline flying the
last sector is responsible for lost or damaged baggage (even if they never received it from the preceding airlines).
The reason for this "multiple ticket no interlining" rule is strictly marketing: to get more revenue to alliance partners.