If I remember rightly S.A.S was one of the first airlines to start the meal in a box. I was given one a few years ago on a flight from Arlanda to Copenhagen and as I was not hungry it was easy to slip in my bag to munch on whilst waiting for my onward flight to GLA.
It's a sensible idea as I was getting fed up having indigestion as a result of having to wolf down the meal on a short haul flight before it was snatched away in readiness for landing.