I was searching for a flight from Riyadh to Medina. In the flight search there was a flight operated by Saudi Airlines as SV1425, which was a 777-300ER
Now thing is that I searched http://www.ch-aviation.ch/aircraft.php and wikipedia.org to confirm if Saudi Airlines has 777-300ER or not and as I suspected, there wasn't. So what it could be, Saudi Airlines website error or something else. See the picture!!!
If you can see the date, it is 22nd Nov which is 2 weeks away. How is it possible to have 300ER. I believe it is the mistake by website developers
A few days ago Saudi confirmed its order for 777-300ER aircraft so you may see the 77W on that route...in a few years!
Only a few days ago I saw Orbitz list an Emirates flight on the 777-300ER as being on a 767-300ER!