The carrier, which flies mostly throughout Europe, said net profit slumped to €14.8 million (US$16 million) in the final three months of 2023 compared with one year earlier.

Chief executive Michael O’Leary said Ryanair was narrowing its forecast for annual net profit to a range of €1.85 billion and €1.95 billion.

It previously estimated between €1.85 billion and €2.05 billion.

“This guidance and the full year result remains heavily dependent upon avoiding unforeseen adverse events” in the group’s current fourth quarter, O’Leary added in the earnings statement.

He identified risks as being “the Ukraine war, the Israel-Hamas conflict and further Boeing delivery delays”.

In the third quarter, Ryanair’s fuel costs surged 35%, while revenue jumped 17%.

Passenger traffic grew 7% to 41.4 million, despite higher average fares which helped to offset other rising costs such as higher salaries.

Its fourth quarter, or January-March period, is traditionally the airline’s weakest.

O’Leary used the earnings release to repeat his complaint that US plane manufacturer “Boeing have more work to do to improve quality, (and) reduce delivery delays”.

A top Boeing executive on Friday apologised for the problems highlighted by the mid-flight blowout of a door plug on an Alaska Airlines flight, as two airlines began returning the troubled 737 MAX 9 planes to service.

The comments from Stan Deal, CEO of Boeing’s commercial plane unit, came three weeks after the major incident which has focused intense scrutiny on Boeing and grounded its planes for safety checks.