Originally Posted by Jespersm
Unfortunately, I've seen many people not having their luggage checked through to the final destination when travelling on different tickets. Due to the new rules on passenger rights, the airlines will not take the chance of being responsible for anything else than their very own part of the trip.
But maybe you will be lucky when all airlines in your trip belong to the same alliance.
I did it just a few weeks ago, flying FRA-OSL on LH, I had a different booking on SK, OSL-TOS a few hours later. Worked like a charm, they put TOS on my bag without even asking.
Im flying OSL-CPH-MAN on Wednesday on an SK ticket, then MAN-ORD on BMI after a few hours. Im sure it will work, but I will check back and tell you how it went.
Like you say, since its *A, it will work just fine