Do I also take actual wind forecast into consideration ? Do I use the right formula ? 389 kt TAS + 10 % for GS in FL100 + or - winds in 100 ? Or is a dumb formula 120 minutes at 389 kt GS ? If the winds etc. plays a role could it be that a flight must be canceled because no alternate available in given 120 minutes ? Does all the EU carriers have the possibility to add 15 % margin for ETOPS 120 so that it makes ETOPS 138 ? thanks for all your help friends