Fly SFO-SAL-MGA 1 Nov 2021 on Avianca using UA air miles. Thinking best enter Nicaragua with onward ticket. After winter there 1 April 2022 thinking MGA-PA-CMN. No acessible info on UA Mileage Plus re fees. Don't usually Book ticket 6 months in advance. Mileage Plus 800# info back to being jammed.
DM