Hi @Suzk123 . I used the Aeroform expander and was very happy generally with the whole process. Whilst I didn't fly with it in, I did do some bushwalks where we were at an altitude of just over 1000 metres (in the NSW Blue Mountains). The expander became very tight and rather sore, but went back down once we returned home. I've heard the same with flying - they tighten up at altitude, then reduce once back at sea level. It's important to mention it to your surgeon, as they'll probably recommend not doing any inflation the week prior to flying, so that your poor old pec muscle doesn't get over stretched when at high altitude.
There are many women in the closed Facebook group Reclaim Your Curves who have flown with the Aeroform expander in place, so you may want to join and find out what their experiences were.
Hope that helps :smile: