Hello all! I am making my first trip to Europe in June. I’m planning to fly most places and only want to take the train from Madrid to Barcelona. I’ve found that I can purchase a one-time ticket for $75, which is cheaper than buying a pass since I’m only taking the train once. My question is, do I need (can I use) a Eurail pass for Airport transfers? If so, would it be better to buy a pass so that I can use it for that as well as my one trip from Madrid to Barcelona? Any advice would be greatly appreciated!