Members of Portugal’s Civil Aviation Workers’ Union and its Commercial Aviation Staff Union have threatened to walk out over 19-21 August.
In a joint statement, the unions accused airport operator ANA of not paying employees sufficiently when the firm is reporting multi-million Euro net profits.
ANA manages Portugal’s three main airports – Lisbon, Porto and Faro.
"Only by doing this [striking], we will be able to achieve what the company has been lacking for a long time: social stability, respect for workers’ rights and, fundamentally, for people," Reuters quotes the two unions as saying in their statement.
ANA said it would seek further talks to continue negotiations.
