Yes. Because the fleet of trucks and busses already exists. Say there are 20 trucks needed for her tour. 20 trucks + 1 plane is worse than 20 trucks and 1 bus. Especially if, as I mentioned, she actually cared and wanted to run on biofuel. She absolutely could. But it’s easier and more comfortable for her to say, “well I bought carbon credits!” while wasting jet fuel for her comfort alone.