I’ll need to fly NYC-UIO and Avianca has the only nonstop. I’m United Plat / * Gold. If I buy a a fare that they call S (which includes a carry on but no checked bags) will my Star Alliance status entitle me to a free bag? And seat selection? And priority security / check in?

The plane is a 320Neo. I noticed online that they let you book the front row recliners for $125 each way which seems worthwhile to me. Does this cost vary as you get closer to the flight date? And does Avianca serve any food for the 6 hour flight or should I carry my own?