Taiwan's Eva Air is conducting a mobile health passport trial on routes from Taipei to both Los Angeles and San Francisco over the next several weeks, the carrier announced. Through Aug. 20, travelers can schedule Covid-19 testing via the AOKpass app and get a QR code for Eva airport staff to scan. They also will need to bring paper copies of their test results per requirements from both Taiwan and the United States, as other airport authorities might ask for them for verification.