BERLIN, Sept 24 (Reuters) - Berlin airport is battling

to restore its check-in and baggage handling systems after a

cyberattack at the weekend, with further delays and

cancellations possible on Wednesday, the airport operator said

in a statement.

Berlin is one of several airports across Europe impacted by

the disruptions, attributed to a ransomware attack on software

provider Collins Aerospace, which have affected dozens of

flights and thousands of passengers since Friday.

It may take several more days before the German capital's

airport has functional and secure software again, with staff

working flat out to process passengers manually in the meantime,

the BER operator said in a statement.

The software provider "has called in other experts and is

working urgently to find a solution," it added.

Passengers should be prepared for long delays, and the

airport encouraged people to check with their airlines in

advance whether their flight was still planned.

Collins Aerospace said on Monday that it was working with

the affected airports, which also include Brussels and London

Heathrow, Europe's busiest.

Berlin airport was particularly busy after a marathon took

place in the city over the weekend, with many runners struggling

to return home.

(Reporting by Rachel More, editing by Thomas Seythal)