I am hiring a car at Lux airport for a week. I am picking it up within regular hours but dropping it off early morning as I have a flight to catch.

I am getting fairly good prices (GBP 150 or so) from the good aggregator sites such as carrentals.co.uk. However, I keep getting hit with a 20 euro surcharge for my out of hours drop-off.

I have dropped off many a car off-hours, usually leaving the keys and papers in a drop-box, or with a duty attendant. I can understand an off-hours charge for picking the car up, but dropping it off ?? Is there some special procedure at Lux airport I am not familiar with ?

D.