FlyerTalk Forums - View Single Post - BA749 Basel - LHR Squawks 7700 and diverts to Stansted
Old Mar 11, 19, 7:30 pm
Join Date: Oct 2006
Location: UK
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Posts: 4,580
I’ll defer to more knowledgable sources but IF this were a fuel emergency then this does NOT mean the aircraft is ‘running out of fuel’. I think flight crew are required to declare an emergency if they can’t be sure they will arrive at their alternate airport without eating into final reserve fuel.

This video shows how some changes in estimated holding time can cause one to have to make a decision as to whether or not to divert:

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