The aviation industry has warned that European airports will face "systemic" aviation fuel shortages if the Strait of Hormuz is not fully reopened within three weeks. The European Airports Association, which represents EU airports, said aviation fuel reserves were dwindling while "the impact of military activity on demand" was further exacerbating supply constraints.

In a letter seen by British media, the association warned the EU transport commissioner: "The airport industry is increasingly concerned about the availability of aviation fuel and calls on the EU to proactively monitor and take action."

"If traffic in the Strait of Hormuz does not resume in any significant and stable manner within the next three weeks, the EU will face a systemic shortage of aviation fuel," the letter reads.

The letter also noted that as the summer travel peak approaches, "air travel supports the entire tourism ecosystem on which many EU economies rely", which exacerbates the above concerns.

Some Asian countries such as Vietnam have begun rationing jet fuel due to supply shortages. Europe has so far not experienced widespread shortages, despite fuel prices doubling and airlines warning of potential flight cancellations.

Global oil prices remain high despite Trump's two-week ceasefire in the Iran war.

The benchmark jet fuel price in northwest Europe was $1,573 per ton on Thursday, compared with about $750 per ton before the Iran war, according to price reporting agency Argus Media.

European airlines say their fuel reserves should last several weeks, but suppliers cannot guarantee deliveries in May.