Traveling from NY to Paris. Please advise airline of choice. Thank you.

whichever is cheapest.

If you're flying coach, they are all very much the same. Go to a comparison site, such as:

www.orbitz.com
www.kayak.com
www.hotwire.com
www.expedia.com

and lots more that others here will recommend.

First:
Plug in your preferred dates of travel on the sites above and let the sites show you all your choices.

Next:
Once you've found a good "fit," go to that airline's URL and plug in the same info. Often times, the airline will be less expensive (often, not always) and it will be easier to make changes, get FF points, etc. by booking directly with them.

Then:
Go to www.seatguru.com and look at that particular plane's configuration to see if you like it, keeping in mind that the airline can always change the model plane they will use that day. Still a good idea to look at this site.

Exception:
If you're flying Business or First, that's a different story. All airlines are not created equal in this category. For example, I like British Airways Business because they offer fully flat beds. A few others do, as well. (FYI, BA flies to Paris).

Next...

You'll have less trouble seeing all the flight possibilities in one place (minus any "discount" carriers) if you go to www.itasoftware.com

cheapest nonstop standard US/European carrier. That would rule out Air India, etc.