annieasquith
There is a special RAF Squadron in the UK available for Government flights. No 32 (Queens Flight) based at RAF Northolt formerly RAF Benson .
They fly royals and government ministers world wide in either fixed wing aircraft or nationally in rotary aircraft.
Being an ardent republican and, apparently, anti monarchy you can be forgiven for not knowing that.
Your wee first lady will not be likely to be entitled to use the facility. Does Caledonian Airlines still exist for her and her fellow anti-English cronies?