Originally Posted by irishguy28

If you or anyone in your party does not hold a passport/national identity card issued by a European Union or European Economic Area member state, then those passengers must print their boarding pass on A4 paper, one sided [i.e. each person must hold their own individual boarding pass, do not print a second boarding pass on the reverse side of the page], and present this to the document check desk at the airport of departure prior to going through security. Passengers without an EU/EEA passport who present a boarding pass at the boarding gate without the document check stamp will be refused travel. At that stage, it may be too late to go back landside to obtain the stamp; so make sure those passengers who need it get their boarding passes stamped landside before going through security.

This holds true for every Ryanair flight that these passengers take. It is not acceptable to show an "old" boarding pass from a previous Ryanair flight with the document check stamp.

All passengers must check in online (except if you opted for the very expensive Business Plus fare) but people who do not hold an EU/EEA passport cannot use the mobile app to checkin and instead must print out their boarding pass as advised above.