Kenya Airways cancelled an unspecified number of flights on Monday after pilots refused to take up some shifts, the airline said.
The reason for a "go-slow" action taken by the pilots was not immediately known but the union that represents them, KALPA, went on strike last year demanding the exit of the then board chairman and chief executive.
"We have cancelled and combined some flights to manage the situation and to ensure our affected guests are taken care of," Kenya Airways said in a statement.
The disruptions at the carrier, which says it carries 12,000 passengers a day, started over the weekend.
KALPA officials did not return Reuters calls seeking immediate comment.
Kenya earlier earlier announced operational disruptions due to flight crew constraints.
The national carrier issued a statement at the weekend saying
they have been forced to cancel and delay several flights.
The airline urged travellers to keep checking the status of their flights through their contact center and social media.
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