MADRID, July 19 (Reuters) - Spanish airport operator

Aena on Friday reported a computer systems "incident"

at all Spanish airports which caused flight delays, while Lisbon

airport, Portugal's biggest, also experienced disruptions amid a

global cyber outage.

Hundreds of passengers were stranded in the departure

hall of Madrid Barajas airport, the country's largest, waiting

for information, according to a Reuters reporter.

Aena, which also operates airports in Latin America and

Britain, said the IT issues mainly affected check-in processes

and passengers information systems.

In a post on social media platform X, Aena said some

systems were recovering and all its airports were operating,

although not at full speed yet.

At Barajas, passengers were being issued with paper

boarding passes instead of the usual QR codes, with staff

removing parts to process passengers through to boarding.

Computer luggage check-in systems were down, meaning passengers

were not being charged for excess baggage.

Several airlines, including Ryanair and Vueling, the

Barcelona-based low-cost unit of IAG advised their

customers of delays, with Ryanair telling customers to come to

the airport to check in rather than trying online.

Iberia said its customers were processed manually from

early morning until 9:25 a.m. (0725 GMT) when it was able to

identify and fix the fault and restart electronic systems.

In Portugal, most flights were departing with a delay of

about one hour at Lisbon airport, but a spokesperson at Vinci's

ANA airports operator could not immediately confirm if the

delays were related to a systems outage.

Dozens of passengers at Lisbon airport were stranded and

left without precise information as their flights are delayed or

cancelled, a Reuters reporter said. At least two flights to

Paris and one to Porto have been cancelled.