Originally Posted by
gaelflyer
But citizenship is relevant in this case. As a non EU passport holder might need a visa for Ireland, although US citizens do not. I expect they want to see your details and so prohibit online checkin.
You quoted me out of context. I was talking in general terms - the point I was making is that Ryanair won't let non-EU citizens check in online even on internal flights. I am aware that EDI-DUB is an international flight. However, Ryanair is fairly unique in barring non-EU citizens from checking in online; no such restrictions exist with other airlines.