@ D.H.U. Freudian slip
"cover entry to toilet"
@ Gcal.....But an aircraft, like a ship, is "stateless"...hence Duty free liquor etc..
Covert surveillance in public areas, has,
afaik, to be signed by clearly-visible public notices....then it's up to you if you want to enter that "zone" or not.
I'd suggest the Spanish economy is doing badly, partly through the artificial increase in overheads by employing security staff where cameras would suffice.
Given time, even if there were signs aboard, announcing CCTV surveillance, most people soon ignore them....the ones to target , are the furtive lookers -around. I see little difference to protecting over 99.5 %of Pax on a flight, this way, than the intrusive, timewasting charade that currently masquerades as "security"....you accept that , or don't fly.....and the drop in airline-travel would appear to indicate there are a significant proportion of the populace who will not tolerate this hassle and use alternative travel means.