https://phys.org/news/2018-10-ryanair-first-half-profits-fall-widespread.html

Ryanair said this forecast—which it had cut earlier this month—reflected "higher fuel, staff and EU261 costs"—referring to EU legislation which mandates passenger compensation in cases of delays or flight cancellation.

"While ancillary revenues performed strongly, up 27 percent, these were offset by higher fuel, staff and EU261 costs," said CEO Michael O'Leary.