Europe's biggest airline plans to eradicate paper boarding passes.
Ryanair said Wednesday that passengers would only be able to board using digital passes issued through its app from November 3.
It's a delay from the May target announced in a press conference last October by CEO Michael O'Leary.
While many airlines encourage passengers to use digital boarding passes, Ryanair would be the first airline to fully abandon paper.
The Irish airline said 80% of its 200 million annual passengers already use digital boarding passes.
It added that the move should improve customer experience and encourage adoption of its in-app features, such as disruption updates and alternative flight options.
As a budget carrier, Ryanair's business model relies on add-ons. As well as baggage fees and selling drinks and duty-free items on board, Ryanair typically charges 55 euros (about $59) to check in at the airport and receive a paper boarding pass.
It expects to "eliminate almost all airport check-in fees" with the change.
On its website, Ryanair also says that paper boarding passes are necessary for passengers departing from airports in Morocco or from Tirana, Albania, to the UK.
This is due to local regulations, so it is unclear what this will mean when Ryanair's paperless boarding takes effect in November.
It is also unclear how passengers without smartphones would board.
If a passenger's phone runs out of battery at the airport, O'Leary has said that there are already protocols in place at boarding gates, per The Telegraph.
In Wednesday's announcement, Dara Brady, Ryanair's chief marketing officer, cited the "massive switch to using mobile" in other ticket industries such as concerts and sports.
"It is time to transition the remaining passengers to digital, which will see them reduce their carbon footprint and receive a smoother and enhanced travel experience," he added.
Ryanair said the move would save more than 300 tons of paper waste a year.
