Surely, you must be kidding...right?I am an F/O at a regional. If the captain trys to take charge, I just tell him i'm going to twist him into a pretzel when we get on the ground. I make sure i'm the one making the decisions. Just because this Geek sitting next to me got here first doesn't mean I have to listen to him. One time I had to karate chop some clown right in the chops because he told me I was to high. I said oh ya. Crack right across the chops. Before the flight was over he was calling me Sir. I know this type of CRM is unorthodox but it works!!!!
Must be flame bait then--regional or not, the F/O is NEVER in charge of the flight (unless F/O is Chk amn giving IOE). The F/O may need to step up to the plate though in hopefully rare instances where the Capt. is going to knowingly/unknowingly jeopordize safety of flight. And then, the F/O should diplomatically but unequivocably state concern and suggested alternative(s). If that goes unheeded--then the F/O must take it to the next level...but I think we all know how to handle that.