5 h delay to JFK? plus 15:15 flight? plus 90 min pre/postflt?
doesn't sum up, unless they can make 45 min or divert.
Even if they can make the 45 mins - this feeds right into that other 777 thread - 21h in a bloody aeroplane. Seriously, you'd get arrested if you tried to drive a car on a public road in that mental state ...