An apology has been issued UK ministers say report into incident leaves questions unanswered over why problem was not discovered and fixed earlierBusiness live – latest updatesA software defect in part of the UK’s air traffic control system corrupted flight data “in the space of a millisecond”, leading to a six-hour outage and mass airline cancellations and delays across the UK last week, National Air Traffic Services has said.But ministers said that the report into the incident still left questions unanswered, saying the... Key points and original sources are listed below.

• An apology has been issuedS1

• UK ministers say report into incident leaves questions unanswered over why problem was not discovered and fixed earlierBusiness live – latest updatesA software defect in part of the UK’s air traffic control system corrupted flight data “in the space of a milli...S2

• The fault caused flights both in and out of the UK to be axed, impacting hundreds of thousands of passengers.S3