British Airways apologized on Friday after the credit card details of hundreds of thousands of its customers were stolen over a two-week period.
British Airways said that affected customers should contact their bank.
The company said the breach is now resolved and the website is back to normal, but for those affected by the hack, here is what you need to know.
Whilst is was not travel or passport details, it was personal and financial details that were compromised.
The thefts occurred during a data breach that affected bookings made on the airline's website and app between August 21 and September 5.
Rob Burgess, who edits a website dedicated to air travel, told The Daily Telegraph: "Data breaches are part and parcel of the world we now live in, and criminal activity is getting ever more sophisticated".More news: Vanilla Ice Stunned Emirates Plane He's Aboard is Quarantined at JFK
IAG, which owns BA and Spanish carrier Iberia, said last month that first-half profits more than doubled.
Customer Mat Thomas said he had placed a booking on August 27, but had not been contacted over the breach.
"We will continue to keep our customers updated with the very latest information", the airline said.
News of the data breach follows a string of IT and technical problems for the carrier.
And in May 2017, BA suffered a major computer system failure triggered by a power supply issue near Heathrow which left 75,000 customers stranded. We take the protection of our customers' data seriously and are very sorry for the concern that this criminal activity has caused.
But hackers were able to access customers' names, email addresses and credit card information, according to law enforcement authorities in the United Kingdom.