Regardless of paid or upgraded status, poor service is poor service...which is not what DL wants its BE service to be.

I had horrendous service (no service really) on a domestic flight (u/g on K fare) and emailed DL about it...it should NOT have taken 90 min (no turbulence, no emergency) to get my first drink on a 3.5 hour flight.

I did not do email DL to get compensation (they did give me 10k miles), but to point out terrible service.

That said, I had fantastic service a few days later and emailed in the appropriate praise.

robin