Last time I went there was a drop off car park that was free for maybe 10 mins. If you want to go into the terminal and go over the free time then you pay on the way out
Dont be tempted to drop them off in the road outside without going into the drop off zone .. car park companies have cameras in the roads approaching the airports and will fine you for parking .. even if it's just for a few seconds. Watch out for the double red lines!