I had a leg out of San Salvador a year ago... at 100 knots, I'm feeling uneasy because it didn't seem like the airplane is accelerating well, and am about to mention it when the CA says "rotate."

My IAS now says 80 knots. We're obviously much. much faster than 80. I check his side and the standby, and we're at V1. Away we go.

Now I've got continuous stick shaker, IAS disagree, altitude disagree, 2 or 3 other issues, including weird stick forces. His side is the "good" side. We level 2,000' as we turn to downwind.

I ask him "You got all the good instruments. You ready to fly this?"

"Naah, you're doing fine. It's VMC. You land it. I'll do the checklist." So I do, by referencing CA and SBY airspeed and altitude.

Point being, the CA as PIC has complete latitude to designate. To this day I thought it was odd that he didn't take the jet. In the end, we found out that my AOA vane had departed the aircraft (738) and this caused far more problems that I would have suspected.

The culture at AA is fine. As FO, you will have plenty to do and there is a lot of trust between crew to get the job done.