Nice model. To digress, I used to live (in 1960s) under flight path to Glasgow Airport. Can remember one day, around 1967, coming home mid-afternoon from school and watching a Heron (BEA I think) on approach. Then a BEA Viscount appeared above and behind it and gradually overtook it on the approach path very close. The only very close near miss I’ve ever witnessed, I was transfixed and I never saw any reference to it in the press. That’s my memory of the Heron.