Use this when the user asks how much parking costs at a European airport for a stay of about 3, 7 or 14 days, or whether a parking price is normal there. Phrasings: "how much is a week of parking at Brussels airport", "prix parking Charleroi 7 jours", "is my quote for a week at Amsterdam airport expensive". Returns the lowest, median and highest public price of the airport's car parks per stay length, only when at least 3 prices were read, with the dates read. Never a price per operator. Data: Park & Keep airport parking index.