If I remember correctly, there were a few rivets missing that allowed airflow to get under the cowling which subsequently ripped it off.
Not quite. I can't see the pic but I will assume it's the Air Tran 320.
The original cowling latches for this engine type could easily be mistaken for locked when they were not. There were a couple of incidents of cowlings coming off around rotation since the cowling was not locked. A subsequent modification to the latch design ensures that if it is not locked it will not be flush with the cowling.
[Edited 2005-03-07 22:26:21]
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo