Multi-city flight trickery
 

So I'm going to Europe on one of those fabulous 50 cent flights from US Airways, but my dad is joining up with me in Ireland (and I'm flying into Frankfurt). Despite my history with Ryanair and getting those even cheaper €0.01 flights, the Frankfurt to Dublin is expensive and requires an airport change in Germany. I noticed it's far cheaper to book a multi-leg to Dublin for my dad from the US, back to the US, but then also throw in my ticket the next day from Frankfurt on the same itinerary. My father and I have the same name, will this work?

Thanks!

Did you enter your birthdate or passport number at any point?

I think in theory the airline can ask for the credit card used to make the booking, but check the Ryanair site.

Other than that, how will Ryanair, or even yourself for that matter, know if the ticket was booked for you or your dad? Maybe when you booked the ticket, you meant to book it for your dad after all - how could you have done it any differently?

It's not using RyanAir, rather using Orbitz's multi-city search. So basically it's just an extra flight tacked onto what would normally be a roundtrip itinerary. There's no mention of birthday or passport number to my knowledge, but I don't think I'm running any other risk than missing the flight and cancelling the rest of the itinerary.