Hi and Welcome Back Aine2 to HealingWell!!
I'm so sorry to hear of your husband's problems while flying! I know one of the biggest things that I've heard of is watching for embolisms (clots) while flying/traveling-don't sit too long and to get up and move around as much as you are able. Plus don't cross your legs...it causes blood to pool and that can cause problems with clotting.
What did the Dr.'s think about his condition and to what did they attribute his problems with SOB (shortness of breath)?
Please let us know how his angiogram turns out~I'm wishing the best!
"Because he is he and I am I."......E. V. Lucas