Because whilst the airplane is a reasonably safe environment, the airports at either end are not.
A lot of cases have spread to A to C because a person flying A-B crossed in an airport with a person flying C-D.
Further a single test is considerably short of 100% reliable, and bear in mind the incubation period.
Last edited by: No FM2R on Sat 4 Dec 21 at 22:42
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