Okay for this you have to transfer 175k points which is very unlikely. The next tier is 20% which is reasonable. Here are some things to know about AC:
UA + other airline mix is not dynamic.
5000 miles for stopovers.
No fuel surcharges.
South America has better pricing for long haul flights under 11000 miles
$150-$175 cancel fee.
Transfers: AMEX, Chase, Capital One, Mesa, Bilt.