Not the case with the Tiger painted 737's, they are the old fuel guzzling, non acars machines, not the nice new SFP ones.
How did SFP 737's with ACARS become more fuel efficient, exactly?
By that I was pointing out the new SFP aircraft in the fleet are more fuel efficient than the older NG's with performance degradation over time. Obviously acars does not make them more fuel efficient, but offers efficiencies in other ways.