We are vaccinated Americans flying to Mallorca. We have 2 children who will need antigen tests (because they are over 6yo) upon entry. When we leave Mallorca, will kids need another test to go to Barcelona even though we are in still in Spain ?
Best to check the official websites. Here is a list of them:
https://www.visitmymallorca.com/covid-resources-spain-mallorca-balearic-islands