At one time - after privatisation - DL was the airline BA wanted to model itself on, size for size, fleet, service .

And remember that BA owned 25% of US in the 90s - and the US FF scheme allowed 100% credit for BA flights when BA were offering much less on most fares.

I remember the initial BA flight to Baltimore on a US 767 disguised as BA with US crew in BA uniforms. Oh yes, BA had changed the 2-1-2 configuration in biz to 2-2-2 .

What's next, I wonder ...