What does a "2500" Delivery Date / Build Year signify?

The use of a "2500" Delivery Date / Build Year signifies the following:-

• The customer delivery is considered ‘at risk’ in our opinion.
  
  
• The customer has ceased trading, however the aircraft orders remain reported by the airframe OEM as current backlog.
  
  
• The customer announces the cancellation of aircraft on order and, if credible, we set the Delivery Year to 2500 pending official notification by the airframe OEM.  The aircraft retains the ‘On Order’ status until such time as we receive confirmation of cancellation from the OEM, and then change the status to Cancelled.