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The three-man crew spotted an unusual object in the sky above St Athan on 8 June in the Vale of Glamorgan.
It made headlines around the world but it was only when newlyweds Lucy and Lyn Thomas saw reports on honeymoon that they realised what could have happened.
The lanterns were lit in Cowbridge and floated off towards St Athan, close to an RAF base and Cardiff airport.
said Mr Thomas, 30, a salesman from Llantwit Major in the Vale of Glamorgan.
There's no doubt in my mind it was our lanterns,
We went on the internet on our honeymoon in Turkey and saw a report about this UFO. I thought, oh no, it was exactly the same time and I remember they were going straight towards St Athan way.
Mr Thomas bought 100 lanterns on an internet auction site and set off about 30 - with guests making wishes - from about 2300 GMT on 7 June until 0200 GMT on 8 June.
said Mr Thomas, who said he checked aviation regulations and made sure the lanterns were set off five miles away from Cardiff International Airport.
I can see how they'd look like UFOs. They are about 2ft 6in (0.79m) high and are paper lanterns with a wax ball underneath.
You light them and they inflate and float off - exactly the same principal as a hot air balloon,
You can't judge their size in the air because they're so bright.
They just look like a big ball of light. When you light them they just go up and up and up.
Strangely enough we saw them in Glastonbury last year and sat there for hours trying to work out what they were.
He said he could not believe the coverage the UFO sighting had had in the media.