It could. Other foreign airlines mention testing.
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QDX HealthID is ideal for a 72 hour window and same test can work on connecting flights.
I would recommend some immunity building herbs and supplements. I can email you some research if you PM your email. I have read a person's immune system at the start of the infection could be the reason for mild cases, as people with underlying causes may have compromised immune systems. No guarantees. Some have been clinically tested against flu viruses, few if any tested against Sar or coronavirus. I know a guy swears HCQ has worked safely for decades and Fauci knows it, yet there are recent clinical tests which say no. Faulty studies vs anecdotal evidence? I can't decide. FWIW.