In an effort to persuade customers to return to air travel during the coronavirus pandemic, one airline introduced a self-assessment meant to protect passengers while traveling in the tight dimensions of an airplane cabin.

On Wednesday, United Airlines announced its “Ready-to-Fly” guidance, which will require all travelers to confirm that they will wear a face mask before boarding a plane. During the check-in process, customers will also need to confirm they have not been in diagnosed with COVID-19 in the past 21 days, have not exhibited symptoms or been in contact with someone with the virus in the past 14 days, and have not been turned away by another airline for health reasons.