My in-laws recently paid for a major portion of my wedding (to their daughter), which was an amazing and unexpected gift...

I want to at least partially return the favor. They have always wanted to go to New York. I want to book the trip for them, and I have enough AMEX MR to do it.

I want to put them in Business class for the flight so they are comfortable (they've never been on a plane for more than a short flight).

Whats the best option (remember, using AMEX MR point transfer partners) for an LAX-JFK in business? I'm guessing my main choices are Delta and CO?