Originally Posted by
ROKNA
If your luggage is not checked through, Out through passport control, collect bags, customs, land side, walk the link T1 to T2, check in, security, gate.There is NO other way
Dublin flight connections is ONLY available on ticketed connections no self connection (Ryanair won't pay for the facility) so even if you had hand luggage only you might be turned back. That said AC and EI have interline agreements so you should have been able to purchase a connecting ticket and checked luggage to destination.
I think this is the key issue - are you connecting through Dublin (single ticket, bags checked through) or taking one flight in to Dublin (collecting your baggage, clearing immigration) and then taking another flight out (checking in, through security)