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On 20 April after an international teleconference headed by the CAA, it was agreed that 2 milligrams of ash per cubic metre of air was an acceptable safe ash concentration.

On Monday the duo appeared in court via teleconference - the first time they've attended a hearing in years - to find out next steps in their bid for release.

"The bottom line is that $11bn is too expensive, and not returning samples until 2040 is unacceptably too long," Nasa administrator Bill Nelson told reporters in a Monday teleconference.

In multiple hearings with Colombian judges, including some by teleconference while in U.S. custody, the former warlord has spoken of his dealings with politicians, and of the potential involvement of high-ranking politicians in war crimes.

The indictment states that McCown had acknowledged the failure of her companies to accurately report the data during teleconferences with regulators that were prompted by the noncompliance notices.