How to get information about old flights (1-12 months)

I am in need of getting information about old flights 1-12 months old, but it seems that all API for getting infromation all have a limit on around 14 days.
Are there any way to get this information ?

br
kao

For older flight data, you must contact our staff to request a custom data report for the flights or airports you require. Historical data beyond 14 days is not available through FlightXML.