I think the argument is that this is precisely the tail end of exceptional conditions overfueling is designed for. If it's typical to fill fuel for 4 hours on a 2 hour flight, and the flight took 4 hours. It seems like this is exactly why they overfuel to 4 hours. If this happens once every 100k flights, then it doesn't even beg the question of "why aren't we overfuelling to 4.5 hours".
This is just clarifying the question from the perspective of an outsider.
That said, an investigation would be pretty reasonable, even if only to confirm that the abornamlity were forces majeures
> If this happens once every 100k flights, then it doesn't even beg the question of "why aren't we overfuelling to 4.5 hours".
- This does not happen once every 100k flights. That's once per day
- If this were happening once every 100k flights we would be adding another half hour to the reserve tomorrow.