Other countries probably won't want to let many people in until a vaccine comes out. But, for domestic travel, it seems to me that the airlines shouldn't need

Other countries probably won't want to let many people in until a vaccine comes out. But, for domestic travel, it seems to me that the airlines shouldn't need too much technological sophistication to make airliners safe, at least for people mature enough to wear some kind of airline-provided apparatus on their face for the duration of the flight.