where no commo
n en route charging zone has been established within the meaning of Article 4 of Implementing Regulation (EU) No 391/2013, and where, as a consequence,
en route cost-efficiency targets are set for more than one
charging zone within the functional airspace block, consolidate these targets to a single value at aggregated level for
en route air navigation services and provide, for information purposes, an overall figure demonstrating the cost efficiency effort a
...[+++]t functional airspace block level.