As various blogs (including OMAAT, where I saw it posted first) are reporting, DL appears to be adding a new daytime flight from JFK to CDG starting next spring. I'm curious what the forum's thoughts are on this.

As much as I am a huge fan of the LHR daytime flights, I'm skeptical of this one for a few reasons...

1. The 10pm arrival is very late, unless you're staying at the airport it's at least 11pm before you get to your destination in Paris.
2. There will be a small number of useful regional connections possible on the JFK side (nobody is going to fly LAX-JFK-CDG when they could just go LAX-CDG on a longer redeye), and almost no useful connections on the CDG side (except maybe a few late long haul flights). But NYC-PAR doesn't seem to have the same level of O&D as NYC-LON (which otherwise has the same problem). OTOH, this is just one flight a day with 238 seats to server the entire market, whereas LON has four daytime JFK departures (AA, BA, B6, and VS) and two EWR departures (BA, UA).
3. Apparently it has been tried various times in the past (including by TWA) but never stuck. In contrast, I can't remember a time when there hasn't been at least one NYC-LON option. (Indeed, DL had scheduled a later daytime flight to follow VS26 but pulled it when the pandemic hit.)

That's not to say I wouldn't use it myself if it made sense, probably NYC-CDG/overnight/CDG-XXX, but I'm not sure what would convince me to book it over a London routing given the longer flight time and the need to clear exit immigration on a landside overnight in Paris.