Cockpit doors were pretty straightforward and appeared almost immediately. There's a pretty good chance we will never have an effective COVID-19 vaccine. No k

Cockpit doors were pretty straightforward and appeared almost immediately. There's a pretty good chance we will never have an effective COVID-19 vaccine. No knowledgeable scientist thinks it's a sure thing, nor that it will be widely available anytime soon. Airplanes are uniquely awful in that people are packed closely together and the air is almost entirely recirculated. Nothing else even comes close.