There have been many postings and answers to your question about flying you may want to do a search in the forum. In general, I believe with the size of your aneurysm you should be fine, things don’t start getting critical until the size approaches 5.0cm. My suggestion, keep staying active and work out (sensibly), you want your body to be in top shape if you ever require surgery. Mine was discovered after a bike accident at 5.2 cm and I was 54 yrs old, I had surgery 3 months later, I was very active and that helped my recovery be very fast, 5 days in the hospital, 3 weeks back to work. Also make sure your cardiologist is experienced in aneurysms, not all of them are, it makes a world of difference. Also, Keep your BP in check, exercise helps with that too