People with mild COPD and pulmonary hypertension can safely travel by air with the proper oxygen accommodations and with doctor's approval. The quality of air changes at higher altitudes, resulting in more exertion to breathe properly. The use of an oxygen tank is recommended when flying, according to Healthline.
Prior arrangements need to be made with the airline to supply an oxygen tank as passengers are not allowed to bring personal units onboard, according to the University of Maryland Medical Center. The UMMC suggests increasing oxygen levels by 1 to 2 liters per minute if already using continuous oxygen therapy. Breathing tests are administered to measure the intake of oxygen at various levels of altitude, simulating the experience while flying.