I'm planning on buying a flight from Ireland to USA. It has 1 stop: Dublin to UK with Aer Lingus, then from UK to America with Virgin Atlantic. I want to do an online check in to get my boarding passes but since it's with two airlines I'm unsure of how to get both boarding passes, I have both apps for each airline on my phone, do I just enter in the booking reference number from the ticket info I receive through email once I buy the ticket into both apps and get both boarding passes separately or what is the process?
I already have visa, passport etc I just want clarification before I buy my ticket. I will also just be bringing hand luggage with me if that is relevant at all.