Is there an ATM on the concourse that US Airways flies into? Also, is there an ATM at the Montserrat Abbey?
Both Visa and Mastercard have worldwide ATM locators on their websites.
It is anyone's guess as to the specific location of an ATM. But they tend to be everywhere and nowhere when you want one. Seriously, there will be ATMs in the main areas of the airport, luggage pickup and most likely in each concourse somewhere.
When you land in Barca you might (50/50 chance) have access to an ATM, but as I recall when landed we went through customs and picked up our luggage in an isolated area of the airport. However, as soon we exited this area (left the security zone) we entered a large concourse where there were drug stores, cafes, and many ATMs. ATMs there are known as "CAIXA" machines. In fact I distinctly remember people from my plane waiting in a line that seemed to be about a 1/2 hour deep to exchange currency at the TRAVELEX when they probably could have just used any of the CAIXA machines to take out Euros with better exchange rates and no line. PS- Eat "boccadillos" (ham sandwiches) as often as you can, they are cheap, delicious, and the main ingredient, Iberian ham, is both expensive and hard to get in the states.