"International obligations
As a member of the International Energy Agency (IEA), the United States must stock an amount of petroleum equivalent to at least 90 days of U.S. imports. The SPR contained an equivalent to 141 days of imports as of September 2016. The United States is also obligated to contribute 43.9% of petroleum in any IEA-coordinated release."
https://en.wikipedia.org/wiki/Strategic_Petroleum_Reserve_(U...
That "6 weeks" probably reflects oil that is already in the refinery supply chain and is therefore deliverable over the next several weeks. The issue is that the top of that funnel is not being refilled.
The US is an exporter of jet fuel but places like Europe and Asia or more exposed to bubbles in the supply chain.
For jet fuel? The article does not say, but if they are correct in predicting shortages in six weeks, then the stockpile (if any) is not terribly large.
> Isn't the entire US national strategic oil reserve only enough for like 1 month of US usage?
In any case, whatever it is, crude oil is not yet jet fuel. The crude has to be refined to output jet fuel (and other oil byproducts), and some amount of gulf refinery capacity is also offline due to one or both of damage or inability to export via sea through the strait.
> ... due to rising kerosene costs, are currently no longer financially viable to operate. There is no kerosene shortage.