I was reading this recent post on avHerald: http://www.avherald.com/h?article=4555e531
I'll admit I am not well versed in fuel regulations, but if BA had to declare mayday after holding for 20 minutes, wouldn't they already be using reserve fuel (or just about to) when reaching EZE? If so, shouldn't they have declared minimum fuel and/or diverted immediately instead of entering a hold?
Obviously, I don't know what their alternate was, but even if we assume it was much closer to EZE than COR is, even after holding 20 minutes, shouldn't they have had enough fuel to head to COR too?
Just trying to understand...