United Airlines today became the first major U.S. airline to ask all passengers to complete a health self-assessment during their check-in process.

The "Ready-to-Fly" checklist asks customers to confirm they have not experienced COVID-19-related symptoms in the 14 days prior to flying.

The assessment is part of United CleanPlus, the company's commitment to putting health and safety at the forefront of the entire customer experience.

The checklist requires customers to click "Accept" to indicate they have reviewed the checklist during the digital check-in process on the United mobile app, United.com, on a United kiosk, or by reviewing and verbally confirming when checking-in with an agent at the airport to receive a boarding pass.

The checklist also checks whether passengers have been denied boarding by another airline due to a medical screening for a communicable disease in the last 14 days, or if they have had close contact with someone who tested positive for COVID-19.

For full information on the United Clean Plus program, please visit united.com/cleanplus.