I fly from Stockholm to Bangkok with an intermediate landing of almost 3 hours in Qatar. The PCR test and the fit to fly certificate must not be older than 72 hours on departure. Does this also apply from Qatar to Bangkok or does it only apply to the departure in Stockholm?
TLDR : Answer Summary
The requirement for the PCR test and fit to fly certificate to be no older than 72 hours applies only from the original departure airport, which in this case is Stockholm. The transit time in Qatar does not affect this requirement.