Best practice and good advice is to avoid air travel after balloon venoplasty.  I made a comment on their blog but it has been blocked, no idea why.

I realise than Canadians must cross a border to receive de-stenosis but there are options in the northern states of the USA which can be reached by land travel.

Balloon venoplasty is still very new for pwMS.  Please study CCSVI Alliance advice on staying local.

Mark Walker