6. Council Regulation (EC) No. 139/2004 of 20 January 2004 on the control of concentration between undertakings (the EC Merger Regulation) - European Air Law (Update) View the chapter 6. Council Regulation (EC) No. 139/2004 of 20 January 2004 on the control of concentration between undertakings (the EC Merger Regulation) by - European Air Law (Update) 6. Council Regulation (EC) No. 139/2004 of 20 January 2004 on the control of concentration between undertakings (the EC Merger Regulation)