Aberdeen International Airport (AIA) earned £9.52 on average for every passenger using the terminal during 2014.
The figure, down from £9.95 the year before, was revealed in annual accounts released by Companies House yesterday.
AIA managing director Carol Benzie said in her strategic report the lower average last year was the result of a £1.6million reduction in income from air navigation services.
The airport made pre-tax profits of £16.67million last year, down from £17.6million in 2013, while turnover for the latest period was up by more than £2.4million to £64.53million.
Passenger numbers for the terminal increased by 8.6% to 3.8million over the course of 2014.
Ms Benzie said: “Anticipated reductions in passenger levels as a consequence of declining oil and gas sector demand following the decrease in oil price will be offset by increased passengers from new scheduled non-EU routes and holiday charters.”
Icelandair recently announced new services from Aberdeen, which was acquired last year, along with the airports in Glasgow and Southampton, by Australian infrastructure firm Macquarie in a deal worth £1billion.
Aberdeen International Airport reports passenger income squeeze