Fairly obvious where it was taken from. From 2007, probably a trip to Japan since that's where most of my business travel was to that year. EXIF data says it was with my D200 and suggests a 24mm focal length for the constituent pictures with the 24-120 lens. I didn't use that lens much as I never really held it in the same affection as the 28-105mm even though it was technically better in many respects.
I can't remember exactly how many pictures it was stitched from, but I do remember the camera was in portrait format, so I am guessing about 5 frames. EXIF says f11 at 1/400th second and I habitually set the camera to manual for stitch shots like this. My workflow at the time would have been to pull the raw files into Lightroom, export them as 16bit TIFFs, open them in PS (probably CS3 at that point) and automerge them, and finally flatten and crop. I wasn't very careful about aspect ratio on the final image typically. I'm still not - I just get the maximum picture, then worry about it cropping it to something specific later if it becomes relevant.
I also remember the stitching as largely painless but I had to do a little footwork around some of the badging on the engine and there is still a mismatch artefact on the outboard engine, but you only see it if you look for it.
At the time I just enjoyed the slightly patriotic feeling I got from the Union Jack with its colours echoed by the view generally, but was disappointed by the very limited view from a single frame shot compared to the view I got when I put my face against the window, hence I had a go at a stitched shot.
Pretty successful given it was rather casually handheld from an aircraft seat, I think.