Don't know about the unit costs but how about:
3-400 litres per hour less fuel burn,
at around 50 knots faster,
somewhere around 15-20 A/C flying 6-8 hours a day, 365 days a year
not to mention reliability and low maintenance costs ( theoretically ) of a new A/C.
Do the math
By the way Stick, you reckon GT has a love affair with NJS, what has caused your hatred of them ?