Airlines with Airbus fleets are dealing with lengthy periods of unavailability due to issues with the Pratt & Whitney engines that power ~60% of A320neos and all A220s[1]. My understanding is that the airlines have agreements where P&W will eventually compensate them for this, but Airbus fleets haven't been without headaches.
[1] https://crankyflier.com/2023/09/26/the-problem-with-pratt-wh...