Eeeeh, no, making you take the plane for health care is not right. It's probably not even legal, unless the government pays it. You have the right to accessible health care. Any doctor has the right to prescribe HRT, and I wager, a lot of them have what it takes to prescribe it safely with a bit of research and maybe a call or two to a specialist. Seriously, no, refuse. Tell him you'renot a doctor who swims in opulence with a huge salary, and that a plane ticket is more than your monthly budget (well, maybe. I don't know your budget). Either he finds you a solution you can reasonably reach with normal transportation, either you're going to self-medicate, because he's asking you something absolutely unreasonable. He should be ashamed.
This is unlike me, but yeah. Be firm and make him know that taking the plane is absolutely unthinkable. He must find another solution, no matter what. I've had it with my own endo's annoyances, and I certainly don't want to see someone else caught in the cage of a doctor's stupidity. See where it's brought me. 16 months of HRT and blood levels of E still barely above male normals. Don't have any patience for incompetent, stupid or stubborn doctors. You'll regret it.