MADRID - SPAIN plans to send three planes to Thailand on Sunday to bring back some 300 of its citizens trapped by the occupation of Bangkok's airports, Spanish media reported.

Two Spanish military aircraft and an airliner chartered from a private company were due to depart Sunday afternoon for Thailand, Europa Press news agency reported.

Tens of thousands of foreigners have become trapped in Thailand after anti-government protestors occupied Suvarnabhumi international airport and Don Mueang domestic airport.

Travellers are currently being evacuated from a Vietnam war-era navy base in eastern Thailand, but progress has been slow.

Spanish nationals were planning to demonstrate in front of their country's embassy in Bangkok on Monday to demand help getting out of the country, Spanish media reported.

Thai police have surrounded the airports, but have so far held off launching an assault and have called on protestors to leave voluntarily. -- AFP