I am afraid you will get nowhere without a diagnosis. You need an X ray, possibly weight bearing and non weight bearing. You not only need a view of the joint (s) but also an assessment of the arches and your gait. Pain can be a symptom of poor gait, and OA is normally an issue in later life
There are a number of podiatrists who specialise in gait and they can also diagnose the problem if it is a particular joint, organising not only X rays but also some blood tests. I would suggest you ask your GP to refer you. I doubt however it will stop you flying.