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`Due to industrial dispute (protest by PIA unions) six PIA flights were delayed yesterday as protesters entered the main data center at PIA headquarters pulling out cables and shutting down computer systems', the spokesman said.
Due to this, PIA's entire system remained suspended for nearly three hours, he added.
`PIA management has requested unions leaders to ensure that these nerve centers of the airline remain out of bounds for angry protesters as any damage to the system can have serious consequences for the passengers as well as the airline', the statement added.