For an individual it's much closer to true. The larger the group the larger the savings from amortizing the costs of the vehicular trip across the group. So it

For an individual it's much closer to true. The larger the group the larger the savings from amortizing the costs of the vehicular trip across the group. So it's not so much blatantly false as dependent on the size of the group traveling. Not to mention to really compare apples and oranges you would have to compare the airlines costs to transport an average airplane load vs the equivalent number of people traveling by road. I have no idea what that comparison works out to but it would not surprise me if the plane wins there.