The strike at Iberia Express, backed by USO and SITCPLA unions, follows several walkouts in Spain and other European countries amid staff complaints over pay amid the rising cost of living and deteriorating working conditions prompted by a boom of travel after pandemic restrictions were lifted.
An Iberia spokesperson did not immediately return a phone call seeking comment.
Iberia Express operates short- and medium-haul routes to more than 40 European cities to and from Madrid.
The cabin crews demand better working conditions and pay rises to offset inflation, both unions said in a joint statement.
"We are very disappointed with Iberia Express's management, which showed it doesn't keep its word and doesn't respect workers who have struggled to keep the company afloat," the statement said.
Airline workers lost part of their income during the pandemic as many where on furlough and some bonuses were suspended.
As travel resumed at an unexpected speed, many airlines have found themselves with staff shortages.
The Iberia strike follows similar ones in Spain at Ryanair , the country's largest airline in terms of passengers, and easyJet during the summer.
Some cabin crews at Ryanair were on their third day of strike this week, though the effects were moderate as no flights were cancelled in the country though several dozens were delayed.
Ryanair crews plan to strike during weekdays until January.
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Is this a copy cat Strike. Following the Spanish Ryanair Strike Actions ?