(AP) – Flying can increase your risk of exposure to infection, but airlines are taking some precautions and you can too.

Air travel means spending time in security lines and airport terminals, which puts you into close contact with other people. As travel slowly recovers, planes are becoming more crowded, which means you will likely sit close to other people, often for hours, which raises your risk.

Once on a plane, most viruses and other germs don’t spread easily because of the way air circulates, according to the U.S. Centers for Disease Control and Prevention. Airlines also say they are focusing on sanitizing the hard surfaces that passengers commonly touch.

Some airlines like Alaska, Delta, JetBlue and Southwest are blocking middle seats or limiting capacity. But even if every middle seat is empty you will likely be closer than the recommended distance of 6 feet to another passenger now that planes are getting fuller.