That makes even less sense. Even if it's one person flying for 6 hours, 2400 gallons of burned kerosene is several orders of magnitude less GHG emissions than 10,000 Americans in a year.

Edit: To put numbers on it, each American emits 16,500 kg of CO2 per year, 2400 gallons of jet fuel emits 21,360 kg of CO2. So it's more like one American's emissions in a year.

Right, so considerably less fuel than a 737 carries. I used that as a worst case and it’s still orders of magnitude short.

1-4 people aren’t flying a plane that burns 400/hour. A Citation burns 160/hour and holds a heck of a lot more than 1-4. A Cirrus jet — perfect for 1-4 passengers burns 47 gallons per hour. Even a Gulfstream V burns 370 per hour and holds 12-16 passengers.