Interior Secretary Ryan Zinke on Friday defended his decision to use chartered flights on a handful of occasions, and said that for most of his flights, “I fly coach.”

Zinke said the charter flights are used when Cabinet members face circumstances that force them to use private flights, and said he would continue to use chartered flights when needed for “official duties,” he said at the Heritage Foundation. He was speaking specifically on using military flights to travel at the behest of the president.