There is an interesting theory from Thomas Lifson in How Tom Price was taken out. This theory holds that Price was seduced into taking those expensive flights by deep state operatives who convinced him it was OK. Excerpt:
What if, for example, when a schedule was presented to Price that featured a the IAD-PHL jet charter, Price asked questions about whether or not this was really necessary. That is what I would expect from a deficit hawk. I expect that he could be present[ed] arguments that this is standard operating procedure. After all, when it was revealed that Loretta Lynch used a private jet to fly to Phoenix – a route flown by commercial airlines -- I don’t remember a single person screaming about the abuse of taxpayers by such flights.
Intriguing and entirely possible. There is another factor, too. The MSM is constantly on guard for something, anything, even if it's less than half true, that will make Trump or his administration look bad.