With oil prices skyrocketing and different fuel taxation in different countries it seems to be a tradeoff to get some more Jet A1 into the fuel tanks where it's cheaper, then fly back to where the price is higher and tank less there. For example: AFAIK in the late 90s LOT's 734s and 735s serving WAW-FRA never tanked at FRA.
>> Q1: Do you know if Airlines "bunker" fuel on certain legs because it's cheaper there?
On the other hand all this "excess fuel" must be moved back into the high-price-country and therefore costs extra fuel on the way back.
>> Q2: Where is the optimum trade-off for such fuel-"re-importing" and is there a formula for the pilots how many excess fuel to order with what variables (price diff in $/liter / length of the leg back / weight of "excess fuel" / add. fuel burn transporting the "excess fuel" / aircraft type / avg. crew age... ?
Any enlightening comment are welcome. Thanks in advance.