Taking individual cars, perhaps. But if you put two people in a Prius you’ll save on emissions relative the the same two flying. Based on [1], flying is roughly 75 passenger-miles per gallon. Prius is 45 MPG, perhaps ~40 under load. So if you have more than one person in your group, better off driving.
The argument could be made that if you don’t board, that plane will still fly and consume the same fuel, but of course the numbers only matter en masse anyways.
