SINGAPORE -- Like most air carriers, Singapore Airlines has suffered during the coronavirus pandemic. But since December, passengers flying the airline from Jakarta or Kuala Lumpur have received a lift from a digital health tool developed by a small startup owned by Temasek -- Singapore's state-owned global investment giant. Singapore Airlines is one of a number of carriers using travel pass software from Affinidi, one of Temasek's little-known startups. The software verifies the authenticity of flyers’ COVID-19 test results. One of its main features is that it supports different health passports, making it simple for airlines to screen passengers.