I must admit, this comes as a surprise to me. From the Josh Willingham blog.
People might think we are allowed to carry on items that a person flying commercial could not because we know everybody on board. But we are not allowed to bring a pocket knife on board, just like the regular traveler could not bring a pocket knife on a flight. And if we had one, it would be taken away.
I really thought if you chartered a plane you didn't go through similar screening procedures to that of flying a commercial airliner. Sure your bags might be X-rayed or searched in the larger airports. But I didn't know that similar rules applied to searching the passengers.
Aside: The day, I think, Wiggins was scheduled to depart for England was the same day of the security alert. I wonder if he ever got there.