Observers of the oil market may be interested in the difference between the types of oil. WTI is different to Brent and includes things like density or (weight) and things like sulfur. There is often a split between prices and where aviation analysts focus their interest is on the middle distillates.
Different oil requires different refining and an interesting situation as referenced earlier in the year (in this thread) may be playing out: A shortage of middle distillate.
As shale became the play, many of the refineries during their maintenance cycles altered the refining towards producing shale oil. Shale is lighter (in comparison to WTI for example) with the result being less middle distillates being manufactured.
Middle distillates include things like LPG, diesel and heating oil. Jet fuel is also a middle distillate.
Well positioned airlines, with fuel efficient fleets have less to worry about. Little Napoleon MAY need another distraction.
Qantas need a new fleet.