Hello,
I know this topic is a basic and many things already written but i can't find myself, I would like to share my story and to get your point o view

Mostly I'm flying for my job on economy tickets China - Belgium around 10 times a year
2-3 times a year china - Israel
1 / 2 Belgium - New York
10 flights + in China domestic

I get the flights according the lowest prices by the company's travel agent
sometimes from StarAlince and SkyTeam or Hainian
Just on SkyTeam i could't decide by whom i will join i tray AirEuropa they have the lowest credit to join a upgrade but in practically i tray to get retroactive from the last few months and they don't have Beijing or other places in their system or Earoflot didn't except it , even its skyteam
I thought maybe to join via Delta but not sure its seems i should spend 2500$ on their own flights
So do you know whats going on with AirEuropa?
and in this kind of situation what is your recommendation?

Thanks for your time and help