Data Center Knowledge - Delta Cancels 280 Flights Due to IT Outage
Delta Airlines cancelled about 170 flights Sunday and 110 flights as a result of a major IT systems outage.
This was a second system-wide outage for Delta in six months due to IT problems and a second major airline outage within a week’s time. More than 200 United Airlines flights were affected by an IT outage on January 29.
Source: Data Center Knowledge
BBC News - Lloyds cyber-attack details emerge
Denial of service attacks are traditionally perpetrated by customers with a grudge or by blackmailers, but there is no indication from Lloyds that a ransom demand was received.
It's likely that systems engineers blocked all internet traffic from overseas locations where the attacks seemed to be coming from, halting the disruption at least temporarily before the attackers switched their activity elsewhere.
Source: BBC News