Two shuttles: GOAirport shuttle and RedDot are both daily van shuttles from NH to JFK. You can also take GO shuttle from grand central to JFK hourly.

That said. Overall interconnecting public transport between rail bus and plane around here is so sucky compared to Europe, for ex.

You can’t even take a shuttle plane from Tweed NH airport to the NY airports.

And Bradley Field in CT - what a joke, the train goes by it, not to it, so you have to catch a bus from Hartford train station.

Anyway, at least for JFk there are two shuttle companies from New Haven, proper that will take you all the way. It’s a miracle

To much old infrastructure. We are way overdue for upgrades and better interconnection

For a daily commute? Absolutely none of this is cheap enough for that.

The shuttle bus from grand central probably isn’t cheap enough for daily expense.

Anything train to shuttle bus or train to subway (cheapest) us going to be three hours each way - that’s six hours a day.

Rent a room in Ny for week nights? Come home on weekends?