Originally Posted by
flyerCO
While not required, DL agents i find generally will interline to other airlines. SAT/AUS frequently do it to AY for me.
If you're kind have have status, they will interline your baggage. I had a ticket last summer from LAX-JFK-LHR (DL, VS) and a separate award ticket on BA from LHR to Ibiza. The kind agent at LAX tagged my bags all the way to Ibiza. They can do it.