Speculation is growing over whether or not the Foo Fighters will announce a headline slot at Glastonbury Festival after a plane was reportedly spotted at Worthy Farm.

The US group teased fans earlier this week when they sent out “boarding cards” for a fictitious “Obelisk Airlines”.

The “First Class” cards list the “check-in time” as 18.00 hours on Tuesday, February 21 and are signed with frontman Dave Grohl's autograph.

The band’s website is also showing a departure board displaying their confirmed tour dates with one date tagged as “PENDING” alongside a line of jumbled letters.

One eagle-eyed fan has since spotted what could be a plane being towed into the festival site.

A picture was posted on Twitter alongside the caption: “Massive plane spotted just at the edge of the @GlastoFest site on Cockmill Ln yesterday...”

The band were set to headline the annual event in 2015, but were forced to pull out after Grohl broke his leg ahead of the gig.

They were replaced by Florence and the Machine.

Speaking about the accident, drummer Taylor Hawkins told NME last year: “It was a bummer when we had to pull out the other year. It was a bummer all round. I mean, Dave almost pulverized his entire f****** leg – and missing Glastonbury was part of that bummer.

Radiohead were the first act to be confirmed ahead of this year's event. They will headline the iconic Pyramid stage on the Friday night. Other acts rumoured to be headlining include Depeche Mode and Ed Sheeran.



Glastonbury 2016 - In pictures 18 show all Glastonbury 2016 - In pictures 1/18 Festival goers dressed as pirates enjoy the atmosphere at the Glastonbury Festival Ian Gavan/Getty Images 2/18 Tom Hammersley, David Hartley, Hannah Brookfield and Deborah Beats from Manchester at the David Bowie tribute karaoke during the Glastonbury Festival Yui Mok/PA 3/18 A festival goers in fancy dress enjoys the atmosphere at the Glastonbury Festival at Worthy Farm, Pilton Ian Gavan/Getty Images 4/18 A festival goer soaks up the atmosphere at the Glastonbury Festival Ben Birchall/PA 5/18 Revellers arrive at the Glastonbury Festival Andy Buchanan/AFP/Getty Images 6/18 A festival goer carries a David Bowie puppet during the David Bowie tribute karaoke during the Glastonbury Festiva Yui Mok/PA 7/18 Festival goers during a tribute to Jo Cox held at Park Stage at the Glastonbury Festival Yui Mok/PA 8/18 Patrick Irish, 30 from Gloucestershire dresses as a ballot box at the Glastonbury Festival Ben Birchall/PA 9/18 David Bowie Fans Neil Atkinson (left) and Joshua Snailes from Cumbria at the Glastonbury Festival Yui Mok/PA 10/18 Festival goers enjoy the atmosphere during the Glastonbury Festival Ian Gavan/Getty Images 11/18 A man stands on his hands during the Glastonbury Festival Andy Buchanan/AFP/Getty Images 12/18 Revellers arrive at the Glastonbury Festival Andy Buchanan/AFP/Getty Images 13/18 A general view of festival goers in the sunshine at the Glastonbury Festival at Worthy Farm Ian Gavan/Getty Images 14/18 Hayley Davies enjoys the atmosphere at the Glastonbury Festival 15/18 Festival goers enjoy the atmosphere during the Glastonbury Festival Ian Gavan/Getty Images 16/18 A festival goer enjoys the atmosphere at the Glastonbury Festival Andy Buchanan/AFP/Getty Images 17/18 Revellers walk in a field at Worthy Farm in Somerset during the Glastonbury Festival Stoyan Nenov/Reuters 18/18 Fireworks explode in the sky during the Glastonbury Festival at Worthy Farm in Somerse Stoyan Nenov/Reuters 1/18 Festival goers dressed as pirates enjoy the atmosphere at the Glastonbury Festival Ian Gavan/Getty Images 2/18 Tom Hammersley, David Hartley, Hannah Brookfield and Deborah Beats from Manchester at the David Bowie tribute karaoke during the Glastonbury Festival Yui Mok/PA 3/18 A festival goers in fancy dress enjoys the atmosphere at the Glastonbury Festival at Worthy Farm, Pilton Ian Gavan/Getty Images 4/18 A festival goer soaks up the atmosphere at the Glastonbury Festival Ben Birchall/PA 5/18 Revellers arrive at the Glastonbury Festival Andy Buchanan/AFP/Getty Images 6/18 A festival goer carries a David Bowie puppet during the David Bowie tribute karaoke during the Glastonbury Festiva Yui Mok/PA 7/18 Festival goers during a tribute to Jo Cox held at Park Stage at the Glastonbury Festival Yui Mok/PA 8/18 Patrick Irish, 30 from Gloucestershire dresses as a ballot box at the Glastonbury Festival Ben Birchall/PA 9/18 David Bowie Fans Neil Atkinson (left) and Joshua Snailes from Cumbria at the Glastonbury Festival Yui Mok/PA 10/18 Festival goers enjoy the atmosphere during the Glastonbury Festival Ian Gavan/Getty Images 11/18 A man stands on his hands during the Glastonbury Festival Andy Buchanan/AFP/Getty Images 12/18 Revellers arrive at the Glastonbury Festival Andy Buchanan/AFP/Getty Images 13/18 A general view of festival goers in the sunshine at the Glastonbury Festival at Worthy Farm Ian Gavan/Getty Images 14/18 Hayley Davies enjoys the atmosphere at the Glastonbury Festival 15/18 Festival goers enjoy the atmosphere during the Glastonbury Festival Ian Gavan/Getty Images 16/18 A festival goer enjoys the atmosphere at the Glastonbury Festival Andy Buchanan/AFP/Getty Images 17/18 Revellers walk in a field at Worthy Farm in Somerset during the Glastonbury Festival Stoyan Nenov/Reuters 18/18 Fireworks explode in the sky during the Glastonbury Festival at Worthy Farm in Somerse Stoyan Nenov/Reuters

Glastonbury Festival is from June 22-26.