18.7. Commission Implementing Regulation (EU) 2024/403 of 30 January 2024 amending Implementing Regulation (EU) 2017/373 as regards the definition of SIGMET and certain requirements for special visual flight rules and air traffic control clearances - European Air Law View the chapter 18.7. Commission Implementing Regulation (EU) 2024/403 of 30 January 2024 amending Implementing Regulation (EU) 2017/373 as regards the definition of SIGMET and certain requirements for special visual flight rules and air traffic control clearances by - European Air Law 18.7. Commission Implementing Regulation (EU) 2024/403 of 30 January 2024 amending Implementing Regulation (EU) 2017/373 as regards the definition of SIGMET and certain requirements for special visual flight rules and air traffic control clearances