B773 & B773ER fuel tanks
Just after some facts between the two aircraft model types.
My understanding is that the 773 has 3 fuel tanks (x1 CWT and x2 Mains) giving a total fuel capacity of approximately 137,500kgs or 171,190L
I have read that the fuel capcity for the 773ER is greater, approximately 145,000kgs.
Does the 773ER have more fuel tanks or have the existing fuel tank volumes been increased?