This thread seems to have drifted into the area of jet handling, whereas I suspect that the original post was related to propeller aircraft. So, in continuation of the current 'Jet' trend, it is true that Attitude plus Power equals performance. The only problem is that jet aircraft engines don't produce power, they directly produce thrust. If we consider the basic formula -
Power = Force (Thrust) X Velocity (Speed),
then it is true for the jet, but as the pilot has no control over the power, he/she must then re-learn the mantra to -
Performance = Attitude + Thrust + Speed.
Now, for a jet, it makes sense. Props are a different matter.
Regards,
Old Smokey