Ryanair has ordered some flight attendants in Spain to repay salary increases of up to €3,000 (£2,525) following a legal dispute with their union.
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.
The salary increase was agreed with the separate CCOO union but it applied to all flight attendants.
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."