MOSCOW, July 29 (Reuters) - Russian airline Aeroflot

cancelled dozens more flights on Tuesday but said it

had now stabilised its schedule after a major cyberattack a day

earlier.

Two pro-Ukraine hacking groups claimed on Monday to have

carried out a year-long operation to penetrate Aeroflot's

network. They said they had crippled 7,000 servers, extracted

data on passengers and employees and gained control over the

personal computers of staff, including senior managers.

The Interfax news agency said Aeroflot had cancelled 59

round-trip flights from Moscow on Monday out of a planned 260.

It said that a further 22 flights out of Moscow and 31 into the

capital were cancelled on Tuesday.

Aeroflot's online timetable showed that all but one of

the 22 cancelled flights out of Moscow on Tuesday had been due

to leave before 10 a.m. Moscow time (0700 GMT), but the schedule

for the rest of the day appeared largely unaffected.

"As of today, 93% of flights from Moscow and back are

planned to be operated according to the original schedule (216

return flights out of 233)," the company said.

"Until 10:00, the company carried out selective flight

cancellations, after which Aeroflot's own flight program

stabilised."

Apart from the many cancellations, Monday's attack

caused heavy delays to air travel across the world's biggest

country and drew anger from affected passengers.

Responsibility was claimed by the Belarusian Cyber

Partisans, a long-established group that opposes President

Alexander Lukashenko, and by a more shadowy and recent hacking

outfit that calls itself Silent Crow.

Russian lawmakers said the cyberattack was a wake-up

call and that investigators should focus not only on the

perpetrators but on those who had allowed it to happen.