Whirls , I was told when we were doing supersonic stuff that we had to know it just in case one day they re inevented concorde or some other such shxt. One day they may have helis that fly at FL110000000 at mach 2.6 ,so the CAA now know that when they do you will be prepared with your vast well thought out CAA education .
Oh yeh and , I was told , its just in case you end up flying military jets . Yeh cos if I could do that I would still spend god knows how much on my groundschool wouldnt I
and besides im 39 dont think the RAF would have me back , maybe as a chock or oily rag or something but certainly not a steely eyed sky god