Voir
http://psk.blog.24heures.ch/archive/2018/04/05/le-senegal-opte-pour-le-l-39ng-865445.html
http://www.defens-aero.com/2018/04/senegal-achete-l-39ng-aero-vodochody.html
https://en.wikipedia.org/wiki/Aero_L-39NG
http://www.l-39ng.cz/why-l-39ng/l-39ng-philosophy/
http://www.l-39ng.cz/why-l-39ng/cost/
