Originally Posted by
chevvron
You mean so that just one incident would take both of them out?
POTUS and his VP never travel in the same aircraft.
Slightly different situation here. The President and VP not flying together is to safeguard the line of succession. Johnson was (at the time of the flight) no longer to be PM, so him crashing on the same plane as Truss would have no impact on the UK's succession of power. Should they have both gone down together on the same plane (quit sniggering at the back!), the Conservative Party would have just had to elect another leader.