Đặt vé bay thẳng nếu có thể. Mặc trang phục và đi giày thoải mái. Cung cấp đủ nước. Ăn uống đầy đủ. Tránh rượu bia. Cố gắng ngủ. Thư giãn trong khi bay.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
As headaches are sometimes triggered by altitude changes, booking a non-stop flight may help you avoid headaches. A non-stop flight will keep you at a consistent altitude for a longer period compared to multiple back-to-back flights.  Altitude changes can prompt changes in your oxygen levels, causing your head's blood vessels to compensate by contracting and expanding. This change in your blood vessels can trigger a migraine.  Booking a non-stop flight can be difficult and costly. However, see i