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For comparison, a regular passenger jet would take just under 11 hours to cover the trip.

A triangular-shaped UFO armed with a single mystery engine, on the other hand, is estimated to reach top speeds of 5,196mph.

This type of UFO would take approximately one hour to fly from London to San Francisco - 91 percent less time than a regular jet.

Mr Dhari created the UFO Travel Calculator with his colleague, mathematician Dr Anna Sczepanek.

A key takeaway from the project is that it would be nigh impossible to recreate these mystery craft and propulsion systems using the technology at our disposal.

According to Mr Dhari, there are "several reasons" such as health and safety as well the lack of powerful and sustainable engines.

He said: "I think the cost to develop and build something is steep given it needs a lot of new technologies from structural safety and propulsion standpoint - especially from a travel flights perspective: Imagine flying a much faster Concorde.

"The environmental impact also needs to be evaluated: the climate crisis becomes a massive factor before any project like this even takes off the drawing board."

As far as the Pentagon report is concerned, Mr Dhari said it is was groundbreaking to see it published.

The publically released report only contained nine pages of a much more detailed and classified document.

But its arrival earlier this year was seen as a very big deal by people involved with the UFO community.

Even if the US intelligence agencies did not reveal the existence of aliens, some experts think it is telling they have not ruled it out either.

Mr Dhari and his colleagues, meanwhile, see the report as a good source of information and data for future research.

He said: "I find it intriguing to know what might come out of it."