Holidaymakers will face higher air fares this summer because of capacity constraints, Ryanair's boss has warned. Michael O'Leary said limiting the number of available aircraft means airlines will struggle to meet demand. He predicted that Ryanair's fares will be up to 10% more expensive this summer compared to last year. Mr O'Leary said this was because the carrier's growth in passenger numbers will be lower than expected because Boeing's new aircraft deliveries have been delayed. Ryanair's original forecast for the year to the end of March 2025 was that it would carry 205 million passengers, up from 183.5 million in the previous 12 months. Mr O'Leary told reporters at the carrier's Dublin headquarters: "With less aircraft, maybe we'll have to bring that 205 million down towards 200 million passengers.