It could be against the sea.A Boeing 777 should fly at about 13km altitude max, while a LEO satellite would be flying at altitutes in the hundreds of km. I can't make sense of that picture in a way that the satellite isn't capturing the ground, unless that satellite is far away and getting a side view, while the path of the plane is of small eccentricity, suggesting a viewpoint closer to the horizontal axis. Someone already suggested that the viewpoint might be from the ground (sorry, chicken memory) and looking at the composite picture, that seems likely to me.
To me it looks like it's a high altitude holding filmed from above. There's quite a few air to air shots from flight decks on airliners.net for example, no reason to not have a video, too.