If you want a dead straight iron shot, you need to have a plane line that is aimed left of the target. Reason being that you have to hit down to a certain degree with all irons, just to make them fly properly. Brian figured this out with Trackman a few weeks ago. The true path of the clubhead will then be at the target. And obviously, you need the clubface aimed at the target as well.
In my estimation, the only thing you could "aim straight" with (meaning straight plane line at the target) would be a driver (if you didn't hit up on it) or a 3 wood (if you didn't take a divot and picked it perfectly off the turf).
In my estimation, the only thing you could "aim straight" with (meaning straight plane line at the target) would be a driver (if you didn't hit up on it) or a 3 wood (if you didn't take a divot and picked it perfectly off the turf).