Just my 2 cents. Two tickets: BKK-HKG-LHR-MAD with the first sector on Royal Jordanian, and others on BA. The other ticket was MAD-SPC operated by Iberia/Iberia Express. Royal Jordanian check-in staff in Bangkok managed to check baggage through to final destination SPC, despite on a different ticket. The staff was very knowledgeable and managed it smoothly - knew exactly what I was asking for. Only boarding card for the first sector was given - all other boarding cards where collected at the transfer desk in Hong Kong; staff there wasnīt very happy that luggage was checked to SPC, but they couldnīt do anything against it and printed all remaining boarding cards.