The US has never had a class system.
Sure it has. Maybe it hasn't been as explicitly defined, but doesn't mean it didn't/doesn't exist. Heck, we even use the word "class" to describe income brackets.
"Human, your request is limited by your physiology governed by the laws of physics. Shed your flesh and embrace the vessel of new construction based on electrons and photons."
While there are certainly biological limits, I highly doubt what we have now is anywhere near the maximum of what is possible if we were designed intelligently rather than by random mutations. It might require wholesale rewrite of our DNA and associated cellular mechanics, but I'm sure that there is plenty of room for improvement. A more likely response would be the AI asking questions about trade-offs that you are willing to accept in order to achieve your goals. For example: Increasing your intelligence beyond X% will require expanding your cranial cavity by Y%, and increasing your daily caloric consumption by Z%. Is this acceptable?
And technically, weight and balance calculations are required before each flight.
Absolutely. Aircraft weight and balance is very important. These calculations also determine how much fuel to carry. Sometimes while in flight pilots will report unexpected fuel burn, difficulty climbing, that the plane is nose or tail heavy, and request an audit of what was loaded onto the plane (baggage/cargo). Also, if you've ever been on a plane that's relatively empty, you may notice flight attendants spreading out the passengers so that they all aren't in the front, or wherever.
For those considering it. Fargo is a caricature. Beware.
I've lived in the Minneapolis/St Paul area my entire life and have rarely ever heard anyone talk like that. Weather wise, around minneapolis (where the vast majority of the tech workers will be found) the temperature varies from a windy around -20 F in the deepest part of winter to around 100 F & high humidity in the hottest days of summer.
//GO.SYSIN DD *, DOODAH, DOODAH