For truly large spend, AA had a corporate amex card - we did not get it due to application process.
But still at that level of spend he is better off with BofA premium rewards for business 6M x 2.625c - 155k $ in real money, not funny money
Not to get political, but with BofA stance on 2A and what they did by volunteering data to J6 congressional review etc without a subpoena. I can't imagine them even acknowledging that bank exists.
Also, he has 2-3 years of spending planned, then he will back off the growth a bit, so this was kind of a 2-3 year shot, bank a crap ton of miles and fly back and forth to Key West for free. They just sold their airplane (nothing fancy - twin turbo prop) and they are probably trying to delay the purchase of a new one for a while.