A bit off the ATC-topic, but still at Lanseria:
When paying landing/handling/fuel fees, be sure that you have the receipts for the previous payments! Had avoid paying (for the 5th time!!!) for previous landings, parking, ect. just because I (luckily) had the receipts because they "conveinietly" did not have any record of previous payments paid. Payments were done by credit card...