Got called back for a job, but haven't received the follow-up call

He he, knowing Spaniards and knowing Easter is coming, it is probably "that time of the year" where things run more slowly, as everyone is thinking already about the holidays - about drinking Spanish wine and eating paella etc.

Usually things slow down as Easter week approaches and they resume normal efficiency after it finishes.

However, some follow up message/email wouldn't hurt for sure - a brief message conveying something like "if you need anything else from me I'll gladly provide it".

You also mention you talked to them on the 22nd? Wasn't that Sunday? Well, airports work 24/7/365 so it probably is business-as-usual, but what if not and they forgot because you sent it on Sunday?

So yeah I would reach out with a brief message asking if they need anything else from you etc.