Lack of staff? I was looking at my delay factors for E-A challenge...

[L1011fan]

and I have a about a 5% delay due to lack of staff yet I have at least one one more person than is required in each category. Ground handling I always add a couple of extra employees due to some flights with really tight turnarounds, so although 5% doesn't see like much, I'm wondering how this could be when every personnel category has at least one extra person than required. I mean it seems like a big percentage for that category to me. Many of them I did not add. Sooooo....just wondering if anyone else out there has had this penalty added to your delay graph and what did you do? Weather is biggest problem with delays in my statistics due to where I am based (SJU) .  My turnaround times are pretty good. Most fall within 1-4% chance of delay. Just some tight ones here and there. Thanks in advance for for any insights on this staff thing!   

[JumboShrimp]

First of all, you need to be aware of that you are looking at a percentage of a percentage.  Meaning, you are looking at a percentage of flights that are delayed (probably low) and then a percentage of them that are delayed "due to lack of staff", again a small percentage.

If you are doing everything else right, aircraft is maintained, scheduleing with reasonable turnarounds, you are reducing the 2 big ones under your control that are causing delays.  So if the total is 100%, and 2 of the big ones are under control, some random number will just inevitably end up in the category you have no control over (as long as all your personnel categories are fully staffed)...

[L1011fan]

I see. I just wondered because it seemed odd. Thanks for the answer!!