I want to buy a roundtrip economy international ticket (booked directly on UA / UA operated / JFK-PPT). I can pay in either miles or $ (the value equivalents are the same). What has more flexibility? Award or paid fare? I have no status with United. Rules keep changing and fine print is frustrating. The flight is in August, but borders might or might not be open. I just want to make sure I choose the option that allows me most flexibility (rescheduling, etc.). Thanks.