ADVICE NEEDED for status match

Hi

In September, my partner and me will be moving from Geneva (Switzerland) to New York City.

We need to re-think our FF startegy !

I am Flying Blue (AF-KL) Platinum, BA Gold and will be LH Senator in a few weeks time (Silver for the moment). I have just lost my status with United.
I am flying in business class when over 6 hours of travel.

From NY, I will be flying to Africa and to Geneva. My LH status will be important for that (SAA, LH and Swiss).

What is new for me will be the internal US travel (including often Sarasota, FL, sometimes LA, Washington DC and Seatle) , a bit of South America and a bit of Asia.

I would like to have status with a US airline, mainly to acces the domestic upgrades.

Would CO be the best choice for me ? They are flying to Geneva too.

For the moment I am using my AF-KL card for upgrades on NW but would like to fly direct when possible.

My partner is Gold with BA and Silver with LH, and will be mainly flying to Geneva (economy !) and domestic incl.to Sarasota FL.


Any advice will be welcome,

Herve