Air Miles and UC

Hello One and All,
Firstly, many congratulations for your 10th birthday and may you long continue.
I have been trawling through various posts regarding air miles and upgrades and l do apologise if this has been answered before but l am a tad confused with these L M N O P fares..so to speak! I know l can call the FC but you guys here have so much experience.
I am hoping to fly to Boston in June, travelling solo for the first time. I have 75,000 air miles and am asking what would be the best way to book an UC flight.
I know l will have to pay something and that's fine. By using the miles does it ensure that l will travel in UC..or are there certain issues l need to be aware of.
I really would appreciate your advice here please.
Many Thanks
Firstly, many congratulations for your 10th birthday and may you long continue.
I have been trawling through various posts regarding air miles and upgrades and l do apologise if this has been answered before but l am a tad confused with these L M N O P fares..so to speak! I know l can call the FC but you guys here have so much experience.
I am hoping to fly to Boston in June, travelling solo for the first time. I have 75,000 air miles and am asking what would be the best way to book an UC flight.
I know l will have to pay something and that's fine. By using the miles does it ensure that l will travel in UC..or are there certain issues l need to be aware of.
I really would appreciate your advice here please.
Many Thanks