Originally Posted by
Treble one
Would these aircraft not be flying well above Civil Transatlantic traffic? 40000 ft plus?
FWIW FL400 plus for civil traffic on (or operating above) the published Organised Track system and elsewhere over the Atlantic is not at all uncommon these days.
The big twins such as the 777, 787 and others may be up at those levels, either for the whole cruise or late on if they are lightweight having burnt fuel towards the end of the Oceanic sector (e.g. heading for Western Europe from the States) and the biz jets are often at FL 400 from the get go and will be dizzyingly higher later in the cruise.