Hold on one sec, they are saving £610 of navigation charges, but burn an extra 1.6 tonnes of fuel.
That is £381 per ton of fuel to make a saving.
Assuimg 1 litre of jet fuel weighs 820g.
Approximately 1220 litres for £381, equates to 31p per litre of jet fuel to make this rerouting cost effective?
Surely that is pretty cheap considering the extra maintenance costs factored in from longer flights?