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British rock singer Robert Plant (L) of the band Led Zeppelin and the group's road manager, Richard Cole, relax on a bed covered by a fur rug and discuss details of their upcoming concert, New York City, New York, July 30, 1973. (Photo by Express Newspapers/Getty Images)

British rock singer Robert Plant (L) of the band Led Zeppelin and the group's road manager, Richard Cole, relax on a bed covered by a fur rug and discuss details of their upcoming concert, New York City, New York, July 30, 1973. (Photo by Express Newspapers/Getty Images)

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Musician John Paul Jones of English rock band Led Zeppelin aboard 'The Starship', a private Boeing 720B passenger jet, during their North America tour, 30th July 1973. With him is his wife Mo. (Photo by Express/Archive Photos/Getty Images)

Musician John Paul Jones of English rock band Led Zeppelin aboard 'The Starship', a private Boeing 720B passenger jet, during their North America tour, 30th July 1973. With him is his wife Mo. (Photo by Express/Archive Photos/Getty Images)

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Express reporter Colin McKenzie (centre, left) at the bar on board a private Boeing 720B airliner known as 'The Starship', which is being used by English rock group Led Zeppelin on their North American tour, 30th July 1973. (Photo by Daily Express/Hulton Archive/Getty Images)

Express reporter Colin McKenzie (centre, left) at the bar on board a private Boeing 720B airliner known as 'The Starship', which is being used by English rock group Led Zeppelin on their North American tour, 30th July 1973. (Photo by Daily Express/Hulton Archive/Getty Images)

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John Paul Jones of English rock group Led Zeppelin plays a Thomas electric organ behind the bar on board a private Boeing 720B airliner known as 'The Starship', which is being used by the band on their North American tour, 30th July 1973. (Photo by Daily Express/Hulton Archive/Getty Images)

John Paul Jones of English rock group Led Zeppelin plays a Thomas electric organ behind the bar on board a private Boeing 720B airliner known as 'The Starship', which is being used by the band on their North American tour, 30th July 1973. (Photo by Daily Express/Hulton Archive/Getty Images)

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A young woman watches a video on board a private Boeing 720B airliner known as 'The Starship', which is being used by English rock group Led Zeppelin on their North American tour, 30th July 1973. (Photo by Daily Express/Hulton Archive/Getty Images)

A young woman watches a video on board a private Boeing 720B airliner known as 'The Starship', which is being used by English rock group Led Zeppelin on their North American tour, 30th July 1973. (Photo by Daily Express/Hulton Archive/Getty Images)