Arcniz...
Great post, if english was my first language, that's probably what I would have written...
Sikorsky...
I fly the 310 and we don't have that message available on our FMC's, and I heard some pilots who fly the 757 at our company saying that they do have that message available... so I think it's only Boeing! If I'm not mistaken, the warning for fuel imbalance comes way late on the 330, anyone can comment?