I suppose it would be totally unreal to accept that a passenger aircraft would divert from original flight plan without informing ATC and proceed on a "touristic flight" as mentioned in the Study.
Not entirely without prescedent.
The mid-air collision between a United Airlines DC-7 and a TWA Constellation over the Grand Canyon in Arizona years ago was attributed to one of the airplanes going on a sight-seeing tour, thus diviating from the flight plan (and ATC approved) route.
Not good policy
