This document provides details of procedures and requirements applicable to the provision and processing of Flight Plans in the pre-flight phase. In particular it prescribes measures to ensure, via the IFPS, the consistency of Flight Plan data held and maintained by Aircraft Operators (and their nominated representatives), the ATFCM system and ATS Units. This document specifies a means of compliance to Regulation (EC) No 1033/2006 as amended by Commission Implementing Regulation (EU) 2018/139.