PLANE-SPOTTERS have been left baffled by a mystery aircraft which spent hours criss-crossing the skies over Scotland without landing.

The Bombardier Global Express, flight number GLEX, was tracked flying all over the southern half of Scotland on Tuesday afternoon, jetting as far west as Jura before looping back to circle over Ayrshire before passing over Glasgow and heading south to Dumfries and Galloway at an altitude of 40-43,000ft.

A spokeswoman for air traffic control service, NATS, said the plane was definitely not a commercial aircraft and suggested it was probably a military jet.

However, a spokeswoman for the Ministry of Defence confirmed that it did not belong to the British military.

More on the erratic plane flight causing eyebrows to raise..