5.10. Commission Implementing Regulation (EU) 2021/255 of 18 February 2021 amending Implementing Regulation (EU) 2015/1998 laying down detailed measures for the implementation of the common basic standards on aviation security - European Air Law View the chapter 5.10. Commission Implementing Regulation (EU) 2021/255 of 18 February 2021 amending Implementing Regulation (EU) 2015/1998 laying down detailed measures for the implementation of the common basic standards on aviation security by - European Air Law 5.10. Commission Implementing Regulation (EU) 2021/255 of 18 February 2021 amending Implementing Regulation (EU) 2015/1998 laying down detailed measures for the implementation of the common basic standards on aviation security