Now, the leasing companies will need to pay millions of dollars to get the planes airworthy again.
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Helios insists its plane was airworthy but Greek television has reported that the 737 had a history of technical faults.
He said the Boeing 737-800 Next Generation plane was received by the airline last month and was declared airworthy.
"Whether it was 10, 8 years old, or not airworthy is something that we can't confirm yet, " Sethi said.
Only an estimated 40 to 50 Spitfires are believed to be airworthy today.
The Temora Aviation Museum boasts 13 planes, including two Spitfires and the world's only airworthy Lockheed Hudson, Meteor and Boomerang.
In May, a coroner ruled the Nimrod fleet, based at RAF Kinloss, had never been airworthy and should be grounded.
The last airworthy Vulcan bomber will fly for the final time next year, the trust which funds the aircraft has confirmed.
The BBMF, based at RAF Coningsby, already has six spitfires but there are only few dozen other airworthy examples in the world.
The coroner has said the aircraft was never airworthy but nobody in the RAF or MoD has ever been held accountable for it.
But Boeing, which makes the Harpoon anti-ship missiles, has also produced more than half of China's commercial jets and ensures they stay airworthy with spare parts.
Mrs Hutchinson was also shown an original Swordfish aircraft - similar to the one involved in the crash she attended in 1943 - which is currently being refitted to be made airworthy.
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