Critical fuel?
How does an ATC supervisor know what we have remaining (real time) unless Engineering picks it out of the CMC....
recently given extra vectors to accomodate "fuel critical" flight YYZ-HKG when we had just done 15 hours from LAX. I guess I should have told ATC we were "fuel critical" (but 8T, on landing, is normal for us on that sector).
Less than 30 min.; declare an emergency, other than that join the pattern.