On the flip side, the cost of JetA1 has also dropped too... but note that ticket prices have not reduced by any similar amount, and therein (
as a result of lower 'Direct Operating Costs' / DOC's... 'coz fuel is now cheaper) profits should be higher.
See:
Platts - Jet Fuel Site
And:
IATA - Fuel Price Analysis
And:
IATA - Jet Fuel Price Development