Originally Posted by
ToiletDuck
They already come in when one of the crew has to go to the restroom however I can only imagine the amount of chattering they'd introduce. Pilots know how to hear a callsign and general procedures. In general they pipe down at the right times as to not interfere with what's going on. I'm not dissing all FA's but within my own base there are several that spending any lengthy amount of time with in the cp would make me want to jump out.
I've had plenty of FA's on the jumpseat in the cockpit over my time with the airlines. Mostly on ferry flights or empty charter repos.
The talking really isn't an issue and you can do a lot to show them the intricacies of your job and how they can help in a big picture sort of way during normal operations.