A flight from Aberdeen Airport that left flight trackers puzzled by its route was carrying out surveys for offshore windfarms.
The BIO12 flight left the airport at 6.49am on Wednesday morning, before making an intriguing series of back-and-forth parallel lines.
It then returned to Aberdeen Airport at 11.41am, after four and a half hours in the sky.
Its final flight path left viewers confused regarding its purpose.
During the flight, about 500 people tuned in to watch it live – making it the 9th most tracked flight on website Flightrader at the time.
What was the plane doing?
Aberdeen Airport has said it was a survey flight carried out by the company Ravenair.
Initially, it was not clear what the plane was doing.
The aircraft was a Vulcanair P68 Observer 2, which is a plane specialising in observation and patrol roles.
Owner Bioflight later confirmed the aircraft was carrying out studies for offshore renewables.
A spokesman said: “The aircraft is owned by us and it is performing environmental surveys in connection with offshore windfarms.”
On their website, Ravenair says it can do reconnaissance, air-to-surface photography, air-to-air photography and many other types of survey operations requiring an airborne platform.
This is not the only interesting flight to come out of the airport recently.
Last week, a US military helicopter was spotted in the sky above the airport as it was spotted by residents.
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