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The current one-price-goes-anywhere USO means Royal Mail has to deliver post six days a week, from Monday to Saturday, and parcels on five from Monday to Friday.

And after the U.S. entered World War II, she volunteered as a USO girl, dancing with young soldiers on the Santa Monica Pier, she said, “before they went overseas to God knows what.”

The Irish airline has written to Spanish trade union the USO to say it will be informing its members how much they owe after it won a court case which nullified a pay deal agreed with a different group.

Ryanair said: "USO are complaining about pay cuts that result from their court case. Ryanair is complying with the court case that USO took to cut pay while it is under appeal."

According to the USO, the rises that Ryanair is attempting to claw back from union members range between €1,500 and €3,000 and were paid between October last year and March, when a Spanish court gave its ruling on the original salary deal.