Changes made by Commission Implementing Decision (EU) 2018/2021 of 17 December 2018 amending Implementing Decision (EU) 2015/348 as regards the consistency of the revised targets in the key performance area of cost-efficiency included in the amended national or functional airspace block plans submitted by Portugal and Romania (notified under document C(2018) 8489) (Text with EEA relevance): Commission Implementing Decision (EU) 2015/348 of 2 March 2015 concerning the consistency of certain targets included in the national or functional airspace block plans submitted pursuant to Regulation (EC) No 549/2004 of the European Parliament and of the Council with the Union-wide performance targets for the second reference period (notified under document C(2015) 1293) Text with EEA relevance