“Who cares about air filters if the crew is infected or the person next to you is ? Its a petri dish potential victims we should be checking all when they land from overseas.”
Screw that, QUARANTINE THEM if from the US, and ban them if from other countries.
But I’m thinking longer-term regarding the fallout from this. For starters, I’m convinced the days of saving fuel by recirculating cabin air are over...and we’ll have to pay the extra 2% or so to have fresh air full time (and we’ll arrive much healthier). Cruise ships will have to totally revamp their systems too to stop mixing everyone’s air. But both industries will have plenty of time - by this time next week, half of the world’s commercial jets will be on the ground...and it will be years before the fleet is flying at last year’s levels, if ever. Cruise ships will be in even worse shape. They had one chance to get it right with the Love Boat, but they blew it...and they keep doubling-down by still running their boats.