Harro Ranter, director of the Aviation Safety Network which catalogues plane crashes, says clusters of accidents are not unusual. Analysing the number and frequency of fatal crashes of aircraft capable of carrying 14 or more passengers since 1990, he finds 45 dates when there have been two or more crashes (excluding collisions).
In 105 cases there have been accidents on consecutive days. In fact, Ranter says it is more common for an accident to happen just one day after another crash than two, three or more days later.