Hello! I currently live in the DC Maryland suburbs and next year I'm moving to Halifax. Right now I have about 75k miles with AA, 100k citi thank you points, and 20k starpoints.

I had been hoping to use the thank you points fixed flights to fly from halifax to dc, but I think fixed point flights have to originate in the US.

So I've noticed that the only nonstop flight from halifax to dc is on United or Air Canada. Does it make a difference which of these I buy the ticket from? Which of these FF programs would it be more beneficial to earn miles with or is it the same?

I hope to use the miles for future travel with my husband where we do not have to transit through the US, if this makes any difference.

Thanks for your help!