Ok so I am moving to the states next week flying with VS of course
I have a question. Which Frequent Flyer Scheme is better Flying Club or Delta Skymiles? Basilly we will be living in NYC and maybe flying once or twice a year back to Europe. My other half is from near Minneapolis and delta is the biggest carrier flying into and out of there.
Can someone use delta miles to upgrade on VS or vice versa? Which scheme do you think is better?

I have a question. Which Frequent Flyer Scheme is better Flying Club or Delta Skymiles? Basilly we will be living in NYC and maybe flying once or twice a year back to Europe. My other half is from near Minneapolis and delta is the biggest carrier flying into and out of there.
Can someone use delta miles to upgrade on VS or vice versa? Which scheme do you think is better?