If DL stops interlining bags on separate tickets, they can reduce their liability for things going w

Delta and most of the other US network carriers have checked in bags to the final destinations even when the passengers virtual campus tours have had separate tickets. This practice is coming to an end on Delta starting on January 15, 2013. Delta has issued the following statement, although it is not publicly available on Delta.com.
Effective for travel on or after January 15, 2013, Delta Air Lines policy will be to check a passenger's baggage between virtual campus tours the origin and destination points that are indicated on a single or conjuncted ticket exclusively. If a second ticket is presented for travel on another airline beyond the destination of the first ticket, the passenger will be advised that Delta will only check the bag to the destination on the first ticket(s). The passenger must collect virtual campus tours the baggage at baggage claim for their first ticketed destination, and then re-check their baggage with the down-line carrier for the next flight.
Previously, in cases where a passenger presented more than one ticket to a Delta airport agent at the origination point, Delta would offer to check the baggage from the origin on one Delta ticket to the final destination on the second ticket, collecting both Delta's and the other airline's fees. This was done on a courtesy basis but has never been part of an official policy.
virtual campus tours The policy update does not apply to interline itineraries, wherein the passenger has an entire journey on one ticket. In these situations, Delta will continue to check baggage through to the ticketed destination as normal virtual campus tours policy.
Delta Policy: Delta will check the baggage for the ATL to LAX flight only. Upon the flight's arrival at LAX, the passenger must collect the baggage at the Delta baggage claim and then proceed to check it with the down-line carrier for the next flight LAX to NRT.
There are often discounted air fares that do not allow end-to-end ticketing i.e. using Delta filed fare to Los Angeles and Cathay Pacific filed fare from Los Angeles to Hong Kong. Until January 15, 2012, Delta can (or could) check your baggage through to Hong Kong. After January 15, you need to collect your bag(s) in Los Angeles virtual campus tours and recheck with Cathay Pacific.
There is no need for Delta to do this. Sometimes having separate tickets virtual campus tours is the only sensible solutions. Passengers must reserve virtual campus tours lot of extra time for picking up bags, considering how long it usually virtual campus tours takes for US carriers to deliver them, and then rechecking them with other carriers.
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IATA s interline agreements govern the way that airlines work together, and they provide a clearinghouse for airline claims virtual campus tours against each other for partial revenues from tickets, re-routing of passengers and, crucially, costs incurred to reunite passengers with lost baggage.
Those agreements stipulate that the airline who first accepted the bag is on the hook for any costs incurred due to delay/loss/damage of that bag. Baggage tracing service virtual campus tours at the final destination is provided by the agents of the last airline you flew, but the bill gets sent to the airline whose code is listed on the bag tag. If some flies your example of ATL-LAX-HKG, on the way out the bag will have a Delta-issued bag tag, and on the way home they ll have a Cathay-issued bag tag. Whichever carrier issued the tag pays any and all costs, with these claims netted off against the claims of other carriers via the IATA clearinghouse.
Because IATA works on the assumption that most passengers will be flying round-trip, they figure that over time, things will more or less even out between airlines, because your bags are roughly as likely to be lost on the way there as they are on the way back.
If DL stops interlining bags on separate tickets, virtual campus tours they can reduce their liability for things going wrong. Let s say you fly ATL-LAX on Delta, then LAX-HKG-BKK on Cathay. If the bag gets stuck in HKG, DL is on the hook even though they had no control over that part of your itinerary. If they check it to LAX only, the liability they have assumed is for processes within their control. Once you re-check the bag in LAX, on a new Cathay tag, the liability moves to Cathay.