The Center for Disease Control and Prevention has issued general guidelines and travel related guidelines – https://www.cdc.gov/coronavirus/2019-ncov/travelers/travel-in-the-us.html. We recommend all travelers educate themselves on the best preventative measures against infection as directed by CDC.
NEW – Effective July 2 on Allegiant –http://ir.allegiantair.com/news-releases/news-release-details/allegiant-expands-health-and-safety-commitment-requiring
TSA is allowing 12 oz bottles of hand sanitizer in your carry-on luggage. You should expect that containers larger than 3.4oz. will need to be screened separately, which will add some time to the checkpoint screening.