The federal probe agency wants to question and record Ayyub's statement in a money laundering case against her.
According to FlightAware, a flight tracking company, more than 9,500 flights within, into or out of the United States were delayed and more than 1,300 were cancelled due to the system failure.
Congress leader Rahul Gandhi appeared before the Enforcement Directorate (ED) on Wednesday for the third consecutive day of questioning in the National Herald money laundering case, with the agency seeking answers on decisions taken with regard to the media organisation and its owner Young Indian.
