There is zero data to support the thought that domestic airline travel, in its current form, has any significant impact on spreading Covid, and given the small number of travelers currently, the assumption that even a full stop of travel would have an impact on the overall numbers is ridiculous. The fact that other countries may be evaluating this as well does not make it a good idea - plenty of places have implemented ideas that turned out to be useless or even worse, added to the infection rate. The only piece of evidence that indirectly supports these types of edicts is the recent research extrapolating (and even this is not fully vetted) that people w/o symptoms are estimated to cause the spread of almost 50% of cases, and if you use that as a reason, you really need to close down the economy as a whole again.