While high-altitude passenger jet aircraft are pressurized, they are not pressurized to sea level or to ground level where most passengers reside. Aircraft cabins are usually pressurized to an equivalent of six or seven thousand feet above sea level (moderate mountainous elevation) and cannot, according to Federal Regulations, exceed an equivalent of eight thousand feet

At these cabin pressurization levels, some persons with heart or lung problems may experience breathing orother difficulties that can be prevented by the use of supplemental or medical oxygen.

Customers with chronic illnesses, especially asthma, emphysema, chronic bronchitis, COPD, pneumonia, anemia, cancer, angina, CHR (heart failure) or other chronic heart or lung conditions are encouraged to consult with their physician before flying.

Physicians from United's Medical Department are also available to discuss medical options, treatments, and alternatives with your physician in order to help ensure that your trip will be safe and comfortable.

Passengers requiring medical oxygen during flight must use equipment provided by United, but we can transport your personal oxygen equipment, provided it meets certain packaging and labeling requirements. You can make arrangements for medical oxygen through United Reservations. Medical oxygen is available for a reasonable service charge per flight segment. This service is not available on United Express flights.

If you plan to use United's medical oxygen, our reservations personnel request 48-hour advance notice to process your request. We will need specific information, including the name and telephone number of your physician.

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