Le Boeing 777X contre le 777-300ER - Quelle est la différence?

There are actually six existing versions of the 777 (not including any special one-off private versions, or military versions) and two new versions (the 777X series) that are about to start flying. They are:

• First Generation – Boeing 777-200, 777-200 Extended Range (ER), and 777-300
• Second Generation – Boeing 777-200LR (Long Range), 777F (Freight) and 777-300ER
• Third Generation – Boeing 777X-8 and 777X-9

via Simple Flying