British Airways apologises for London airport check-in delays

British Airways has apologised to customers who were held up in Gatwick and Heathrow airports on Sunday after problems with their check-in system left many disgruntled.

The airline was trying to upgrade its system on one of the busiest days of the year for travellers.

BA apologised for the inconveniences caused to passengers, saying that "our IT teams worked very hard to quickly fix a short-lived problem with our check-in system."

"We are sorry for the delays some customers had as they checked in for their flights."

Many passengers tweeted their discontent with BA on Sunday.