Clinton has secret service protection and the US AG probably does as well.
The SS sends in a team first to sweep the area and make sure the area is safe.
The Clintons don’t do anything unless it is planned and scripted. Remember Bill and Hillary dancing on the beach in their swimwear after the Monica news came out?
This meeting was planned a while ago and Bill had a specific agenda. And I would bet that Loretta was reminded about all the dead bodies in the wake of the Clintons.
A little fantasy here:
The Secret Service bugged the plane.