Passengers were experiencing delays, but no flight were cancelled at Budapest's Ferihegy international airport today as a result of new industrial action, an airport spokesman said.
"All early flights have taken off. There are no disruptions, no cancellations, but we're asking passengers to check in three hours ahead of departure," spokesman Domokos Szollar told commercial radio station Klubradio.
Szollar said that participation in the strike was low, with 76 percent of staff, or 256 out of a total 337, reporting for work.
Negotiations between unions and management began at 10:00 am (0900 GMT).
The unions have rejected mediation, Szollar said.
At 4:00 pm (1500 GMT) on Monday, trade unions RDSZSZ and LESZ, which represent service staff in areas such as security and aircraft refuelling, resumed a strike launched back in December.
The dispute is over a new staff contract and a restructuring programme to boost competitiveness and profits.