No Passengers Allowed
Our FOM prohibits passengers from occupying the observer seat. And this is a great example of why.
We had to do a go-around at PDK last week due to "controller training in progress". The local controller calls us on a 4 mile final (we were less than 2) and clears a Hawker for takeoff. When we told the controller we were well inside 2 miles, he told the Hawker to hold short. The Hawker pilot either a) didn't understand the difference between the ILS hold short line and the runway hold short line, or b) lied when he said he was already on the runway AND tells the controller "they have to go around". I had already made that decision and was pushing the power up. The local controller let the trainee attempt to unravel the mess he created (a mistake, IMHO), which continued to snowball as we flew a visual pattern back to 20L. By the time we landed, there were 2 more go-arounds by other aircraft and we had an RA. Only 1 passenger even inquired as to why we went around. Had one been sitting up front it would have involved a lot more questions at the wrong time.
Yes, it is times like these I'm very happy to not have a passenger sitting on the flight deck.