I'd rather post questions than opinions...I was tempted to ask if the main tanks were empty at launch, but it seemed too far fetched...the takeoff would
have been way too lively....what part could the wing tanks have played? Can they be replenished in flight? They are filled top of wing, yes? Do full wing tanks account for two hours of burn? If they launched with wing tanks, could there have been a switching issue when they got low, and the bladders/mains couldn't be accessed? Another direction going, could the lower tanks have been full of LL100?
If the wing tanks had only one load to offer, would the strategy be launch with wing fuel, but use only less than half, try switching to bladder/mains, then if inop, back to wing fuel and home???
conc