Try reading your own reference:
In a recent interview with CNBC's Steve Sedgwick, Ryanair CEO Michael O'Leary was cautious when it came to the outlook for new and emerging technologies in the sector.
"I think ... we should be honest again," he said on Oct. 20. "Certainly, for the next decade ... I don't think you're going to see any — there's no technology out there that's going to replace … carbon, jet aviation."
"I don't see the arrival of … hydrogen fuels, I don't see the arrival of sustainable fuels, I don't see the arrival of electric propulsion systems, certainly not before 2030," he added.