Ryanair carried around 1.5 million more people than this time last year
Ryanair carried nine million passengers last month - a 16% increase on its total for April 2014.
The Irish low-fare carrier handled 91.8 million passengers in the 12 months ending last month, which is a 12% rise on the figure for the year ending April 2014.
Ryanair chief executive Michael O'Leary, explaining the airline's changed approach, has said: "We've moved from being cheap and nasty, to cheap and cheerful."
In an interview with Flight International magazine, he said he had backed up his new strategy with a passenger charter published on the airline's new website.
Mr O'Leary said: "If I'd known it (the charter) would work so well, I'd have done it years ago."
In the interview, Mr O'Leary admits he got some things wrong, accepting that the rigid one-bag-per-passenger policy as well as strict adherence to precise bag size, was actually disruptive to the boarding process.
As the magazine was being published, Ryanair announced it was lowering its airport check-in fee from €70 to €45 and also lowering its missed-departure fee from €110 to €100.