Re: Wind noise
DC --
Basically, you're correct. You can bid anything your seniority will allow you to hold with some restrictions ... for example, at most airlines once you make captain, you're not allowed to voluntarily downgrade to FO again.
There are as many reasons to bid things as there are pilots. Some guys want to make captain ASAP, and they'll fly the smallest airplane and sit reserve to do it. Others want to fly international, and they'll stay in the right seat longer to do that, or any of a hundred other reasons. When you upgrade, though, you do NOT have to go back to the smallest airplane. A person could, for example, start out as a 737 FO, bid 757 FO after a while, go to 777 FO for a while after that, and go straight to captain on the 757 if their seniority allowed without going through the 737.
FL270