The recent outage at UK air traffic control provider NATS week will likely have cost the airline industry up to £100 million ($127 million), IATA director general Willie Walsh has estimated. He said on the BBC's Today programme that the problems had resulted in "very considerable" outgoings for carriers as they were required to cover expenses for customers stranded because of delays and cancellations. "I would imagine at an industry level we are getting close to £100 million of additional costs that airlines have encountered as a result of this failure," he says. Speaking on the same programme, NATS' chief executive Martin Rolfe said a single piece of incorrect data it received in a flightplan had caused its primary and backup systems to fail, forcing services to be processed manually. He adds that measures have already been taken to ensure this situation does not repeat and that a preliminary report on the problem, overseen by the Civil Aviation Authority, will be sent to the government early in September. Walsh complains that the situation is "staggering", saying NATS' systems should reject faulty data instead of allowing it to impact its wider operations. "That explanation [from NATS] doesn't stand up from what I know of these systems," he says. "There are a lot of questions that NATS has to answer." Walsh also argues that, post-Brexit, the UK should reform EU261 legislation which forces airlines to compensate passengers for disruption, instead adopting a more flexible system that direct claims to the part of the industry responsible for causing delays. The latest data shows that disruption continues to ripple from the outage on 28 August, although at a much reduced level. At 09:00, 30 services departing UK airports on 30 August and 34 arriving had been cancelled, in each case around 1% of the total.

The US Department of Transportation has fined American Airlines $4.1 million for violating its rule prohibiting tarmac delays of three hours or more on domestic flights without providing passengers an opportunity to leave the delayed aircraft. The department finds that between 2018 and 2021 the US major "kept dozens of flights stuck on the tarmac for long periods of time without letting passengers off". The DOT notes that American's fine is its largest ever issued for tarmac-delay violations. "This is the latest action in our continued drive to enforce the rights of airline passengers,” US Transportation secretary Pete Buttigieg states. "Whether the issue is extreme tarmac delays or problems getting refunds, DOT will continue to protect consumers and hold airlines accountable." American says that "while these delays were the result of exceptional weather events, the flights represent a very small number of the 7.7 million flights during this time period". The Fort Worth-based carrier adds: "We have since apologised to the impacted customers and regret any inconvenience caused."

The UK Civil Aviation Authority's air navigation service provider NATS has fixed an issue with its flight-planning system that led to flight delays and cancellations on 28 August. At 15:15 in the UK, NATS disclosed that it had "identified and remedied the technical issue affecting our flight-planning system this morning". It adds: "We are now working closely with airlines and airports to manage the flights affected as efficiently as possible. Our engineers will be carefully monitoring the system's performance as we return to normal operations." The flight-planning issue disrupted the ability of NATS's system to automatically process flight plans, which then had to be processed manually, bogging down air traffic control. Irish carrier Ryanair said in a post on social media platform X, formerly known as Twitter, on 28 August that "due to another UK ATC failure, Ryanair will be forced to delay/cancel a number of flights to/from the UK today, Mon 28 Aug". EasyJet noted in a post on the same social media platform on 28 August that it has "been advised of an air traffic control systems failure affecting UK airspace, which is currently causing disruption to flying programmes for airlines operating to and from the UK". The UK low-cost carrier adds: "We are providing customers on cancelled flights with the option to transfer their flight free of charge or receive a refund and recommend that all passengers flying with us today, regardless of their destination, check the status of their flight."