Hi Everyone!
I am flying from TXL-LAX with very fragile luggage packed into 2 104L Rimowa Classic Flight spinners, and I need a some advice on which airline & airport transfer is likely to be the safest and most reliable.

There are no direct flights, so I'll have to transfer at either DUS (AB to AB), JFK (AB to AA) or LHR (BA to BA or BA to AA). I'd prefer to fly coach, but can go business if its a must. I've got AA Gold, so no auto luggage priority, however the contents are covered by supplemental insurance, so signing a limited liability fragile sticker waiver is fine. I'd just really prefer to have everything arrive safely. Any thoughts?

Thanks in advance.