Ireland's Ryanair was quick to seize on the marketing opportunity, tweeting "Should have flown Ryanair" with a picture of the "Computer says no" sketch from the TV series "Little Britain" to poke fun at BA.
The source of the power surge remains vague and a spokesperson for U.K. Networks, who provide electricity to Heathrow, said in a phone call Tuesday that the company "had not seen any issues" on their network. There was no evidence of a cyberattack, according to the airline, The Guardian reports.
British Airways said it would investigate the failure, take steps to stop it reoccurring and was working to return bags to all passengers.
All flights operated from Gatwick on Sunday, but more than one-third of BA's schedule out of Heathrow, mostly short-haul flights, were cancelled.
Passengers on cancelled flights have been told to use the BA website to rebook.
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Responding to the chaos that grounded scores of planes over the weekend, Mr Cruz said: "We do apologise profusely for the hardship that these customers of ours have had to go through".
"We have been giving letters to customers telling them how to claim under European Union compensation rules and we will fully honour our obligations". Now the self-proclaimed "world's favourite airline" is facing compensation claims of up to 150-million euros.
Customers have been left queuing for hours in packed terminals over the last few days and some had to bed down on terminal floors on Saturday.
Many passengers had to leave without their luggage, amid complaints about a lack of information.
BA was hit by an IT problem over the bank holiday weekend, which meant 75,000 people around the world faced disruption to their flights.
"While the costs of passenger compensation and refunds could well run into the tens of millions, the whole sorry episode has undeniably put a dent in BA's reputation for delivering a premium service, and the worry for shareholders is that this unquantifiable impact could have longer-term consequences". The airline asked travellers to desist from coming to the airports.
Some passengers expressed frustration on Twitter over missing bags and long waits in telephone queues to speak to BA staff. BA said it had introduced more flexible rebooking policies for passengers affected.