Chief Executive Alex Cruz said Friday the company is "100 percent committed" to compensating customers whose financial information was stolen.
British Airways has said it will contact customers and will manage any claims "on an individual basis".
"We are deeply sorry for the disruption that this criminal activity has caused", read the press release.
"British Airways is investigating, as a matter of urgency, the theft of customer data from its website, ba.com and the airline's mobile app".
Whilst is was not travel or passport details, it was personal and financial details that were compromised.
North Korean charged in crippling Sony hack, WannaCry virus
The North Koreans also attempted similar unsuccessful online bank thefts between 2015 and 2018, worth an estimated $1 billion. The US has charged a North Korean programmer for the WannaCry ransomware attack in 2017 and the Sony Pictures hack in 2014.
The breach covered customers who made bookings between 21 August and 5 September, IAG said.
"The only good thing we can say about this breach is that BA have provided a very short and specific date range where data may have been compromised". Customers due to travel can check in online as normal.
The theft affects reservations, ticket purchases and other bookings made between August 21 and September 5.
The airline is facing a backlash from customers who have had to cancel cards following the 15-day data breach.
British Airways 747s parked at Heathrow Airport.
Yankees acquire OF McCutchen
If the deal goes through before the end of Friday, McCutchen will be eligible for the Yankees' postseason roster. Before coming to the Giants , he played all nine of his major-league seasons with the Pirates.
Will I have to get a new card?
If European data regulators decide that the airline doesn't take customer data protection seriously enough, they could fine it up to 4% of annual revenue under the recent General Data Protection Rules (GDPR).
Assuring compensation to each of the affected customers, the airline offered to pay for the credit checking service.
British Airways experienced an IT-related crisis in May past year when roughly 75,000 passengers were stranded after the airline cancelled more than 700 flights over three days because of system problems.
"One will be figuring out which cards have been compromised and alerting victims, whilst the other will be trying to abuse them while they are still fresh".
Sen. John McCain's Arizona Funeral Service
McCain "served his country honorably", Pence said, adding that President Donald Trump "respected his service to the country". A number of McCain's former legislative and campaign aides will also serve as pallbearers during the various ceremonies.