Hi, I did review your concern. You can certainly travel in airplane if you are not experiencing any acute shortness of breath. Mild pulmonary hypertension can sometimes lead to tricuspid regurgitation due to backpressure changes but the question is why there is pulmonary htn in 1st place. It should be diagnosed. Please consult a physician at your earliest convinenience for correct diagnosis. there is medical treatment for pulm htn available in market and hence can be treated or slowed down in progression i hope this helps Wish you good luck and bon voyage!