That does look great, the 747 is certainly very well blended

One or two little crits' though. The angle on the 747 is as if taken from ground level, as appose to the backround which is taken from standing. (ie. you should be looking at the 747 from a slightly raised angle, and see a bit of the tops of the tyres) Thus the whole undercarriage looks slightly out of place.
Also the SA airbus is white, so the BA 747 (also white) should be the same shade, whereas its a bit bright.
Sorry to rip, and they above are really little imperfections on an otherwise great edit, just trying to help:D.
BTW i think the smoke is very well drawn, just like you said some photo referencing could give a more realistic spread

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