In Barcelona there is someone taking care of the queue always (I think if a taxi driver allowed clients without due respect to the queue he'd lose airport acces

In Barcelona there is someone taking care of the queue always (I think if a taxi driver allowed clients without due respect to the queue he'd lose airport access rights, so lose a lot of money), and the price for airport-City centre is written in the windows so you see it before entering (and also seen in the inside, it's a fixed price with minor variability depending on day of the week) So, from what I've seen here it's unlikely I'll be taking taxis in Madrid, but will keep using Barcelona taxis when I need them.