As face coverings, hand sanitizer and personal protective equipment have become part of our daily routine, one safeguard has kept American’s customers and team members breathing clean air at 30,000 feet. High-efficiency particulate air (commonly known as HEPA) filters have purified the air on American’s entire mainline fleet — and most regional jets — since the late 1990s. HEPA technology is also used in hospitals and medical facilities around the world, helping keep medical environments clear of bacteria and viruses while providing clean air.
The HEPA filters in use on American’s fleet capture at least 99.97% of airborne microbes by circulating the cabin air once every 2 to 4 minutes. As the filters purify the air on the inside of the aircraft, fresh air enters the engine compressor on the outside. Next, it makes its way into the air conditioning system and is mixed with the recirculated, filtered air. This mixture results in a higher level of humidity in the cabin, providing a more comfortable experience for customers. This mixing process also helps the environment, as mixing fresh air with recirculated air results in a lower overall fuel burn.