Originally Posted by
WineCountryUA
Whenever you see an N at the later part of a fare basis be very suspicious -- many times signifying Nonrefundable, always check the fare rules to verify.
Yep. The UA booking engine doesn't work right if you ask it to give you a refundable fare *and* a miles-based upgrade. Unfortunately, the reasons I can't figure out, the miles-based upgrade eligibility may fizzle when you go for the refundable fare. That I don't get.