I originally posted this in another thread but this thread seems like a good one to restate the obvious.

"For what it's worth, there are many FO's out there flying the line for the airlines with 1000's of hours in jets over many years, that do not feel comfortable in upgrading because they do not feel that they know enough or feel comfortable in "The Final Authority" role cast upon the PIC.

These professional pilots are much more realistic when it comes to knowing their own skill-set than do many of these lower-time pilots. The ones I'm specifically talking about are the ones who mention upgrade time in their post when all they have is 350/25. I bet many of you would freak out if the captain of an RJ had to go to the bathroom while in flight and you now had to become the sole operator of the plane."