In August 2017, the inspector general of the EPA launched a probe into Pruitt's travel to and from Oklahoma at taxpayer expense. In September 2017, it was revealed that Pruitt had used at least $58,000 worth of noncommercial charter flights and military flights during his tenure, and when traveling on commercial airlines had opted for business or first class when those seats were available. In February 2018, a "Washington Post" investigation determined that Pruitt has thus far spent hundreds of thousands of dollars on first-class airline travel, charter flights, military aircraft and luxury hotel stays, potentially contravening federal travel regulations and contrary to the practices of his predecessors, who routinely traveled in economy class. On June 5, 2017, for example, Pruitt billed the government for a $1,641.43 first-class ticket on a flight from Washington, D.C. to New York.