The actions of a technician who switched off and then reconnected the power supply to BA's data centre are expected to form the centre of the inquiry, which will be carried out by an as-yet-unnamed external company.
Willie Walsh, the chief executive of the airline's parent company, IAG, said the technician responsible was "authorised to be in the room, but wasn't authorised to do what he did".
He added: "You could cause a mistake to disconnect the power - it's difficult for me to understand how you can mistakenly reconnect the power."
If that had not been the case BA could have quickly recovered from the power outage, Walsh claimed.
"That in itself was a problem that we could have overcome probably in a couple of hours, I don't think it would have led to any cancellations."
According to a report in the Guardian, Walsh said BA's communications had been poor after the incident, in which thousands of passengers were stranded at Heathrow before having to queue to leave the airport.
He added: "It's damaged us, but it hasn't destroyed us in any way. We've recovered from worse. The BA brand is incredibly resilient."
Speaking at the International Air Transport Association global summit in Mexico, Walsh said of the fiasco: "It's something I wouldn't wish on anybody or any airline, when you see the customers who have suffered. I'm hoping people will be able to learn from the experience we've had and we'll all be better as a result.
Disclaimer: No Business Standard Journalist was involved in creation of this content
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
